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Jean Segura's swing reminds you of Adrian Beltre's.  Minus a bit of "oomph" and followthrough.  It's quiet, sudden, compact and its "keeps weight underside."

In fact it's "sudden" enough that you have a hard time pausing the tape for the right screenshots.  But here is the video we got the captures from.  In the first pic, his hands are in the most relaxed launch position possible (sometimes his hands are a little lower than this).  You see a loose and neutral body position and you can see the "keep weight underside" effect in the way his armpits are anchored to the dirt:

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In the 2nd pic below you can see a golfer-type steady head with the lead hip and spine rotating as he sinks very subtly, the way a golfer does.  Check the bill of his cap against the white fence stripe.  In fact the launch is so surgically-quiet, so oriented towards consistent contact, that the question really becomes how this player generates power.

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In the 3rd pic, below, you can sense the "late uncoiling" as he tucks his bottom elbow to keep the arms extended.  The head remains eerily quiet and he hits against a firm front leg with the back toe barely touching the ground, as with Beltre:

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In the 4th pic you see a followthrough that does NOT leave him struggling to stay on his feet, the way Beltre often does.  The entire swing leaves the impression of "swinging inside a phone booth" with power coming up through his big toes.  

By the way, "Keep Weight Underside" is an aiki concept that implies stability, and peace, and absence of panic.  It's used in Buddhism to convey the idea of generating "ki" from your waist and center of gravity -- and below -- as opposed to getting shrill and bringing your energy up into your arms as if to swat away bees.

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Here's a 5th pic, a random shot of his 2nd homer in the game.  In this one he turns on the ball with more 'elan as you can see in the belt buckle.

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Other hitting clips selected for your convenience :- )

A Beltre-style RBI single lashed to left ... hands a little busier on this one

Five hits here:  a Justin Upton-style homer to center ... another "keep weight underside" Beltre-style single up the middle ... an up-in pitch smoked over the LF wall the way Adrian Beltre does to Felix ... an infield hit in which he shows solid to better-than-average speed up the line ... an Ichiro-style decelerated swing that covers a pitch at his ankles.

In this one he lets the pitch travel deeeep before unleashing the "quick-swat" swing.

One other observation:  Segura definitely prefers to extend his arms; his exit velocities are lower on inside pitches, and he's better with HI-AWAY and LO-IN balls outside the zone than he is with HI-AWAY and UP-IN pitches.  But he is no slouch at driving the inside ball when he guesses correctly.  Check out the homer at the 0:25 mark on this video.

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EXEC SUM

Segura had a low 16% rate on "soft" hit balls last year and a very low 7% swing-and-miss rate.  Think Kyle Seager.  It's rare to see him embarrassed on a swing, and technically it's a contact-first swing, but somehow a medium-sized player gets "plus" acceleration through the strike zone.  Segura is a little earlier in his development than Seager and a little more oriented towards spraying crisp batted balls around the diamond than towards stalking pitches.  But it's only one notch.

Adrian Beltre has hit a good consistent .300-.320 since leaving the Mariners, with only about 40-50 walks and (lately) a .450-.520 SLG.  It's not a bad comparison, Beltre and Segura, in terms of:

• Infield players
• .300 hitters with nice pop
• Style of swing, approach to the pitcher
• Hand-eye coordination at the plate

Beltre of course is closing in on 3,000 hits and Jean Segura has a thousand miles to go to earn Beltre's place in the game.  For 2016, though, the two were close comps in the Bill James system, meaning, you could have traded one player for the other and not affected either team much.

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OTHER VIDEOS

Defensively, Segura is an explosive athlete, great with step-and-dives and layouts, almost in a 3B fashion.  The slow-mo on the first play in this video gets the point across.  The second play shows the easy range and the feather hands.  The third play, a layout up the middle, is extra fun to watch.

This short-hop shows off the explosive hands.  Finally you can enjoy the blurry-fast shortstop hands in this video.  How's the arm?  Well, the Fans' Scouting Report by Tom Tango gives him credit for a plus-plus arm.  Couldn't tell you m'self.

Here is a triple in which you can see (coming around 2B) Segura's "fast-scamper" running style.

Here is an interview video in which you get an inkling that Segura is a socially-awkward, rather shy person when he's in unfamiliar settings.  (Keep in mind that he's being interviewed after a 4-hit night.)  Which would be the more important that he came to Robinson Cano's team.  Such people can do better-than-expected when comfortable and worse-than-expected when unappreciated.

Yo' turn now,

Dr D