I like Segura more than Marte, for sure - but Segura was a smoking crater on offense for the 2 years before this one. Nothing says he couldn't deliver a Marte-level season in 2017, which makes this coming offense much like last year's (since Segura was the main offensive add). Seattle's 2016 offense was carried by a 35 year old DH (147 OPS+) and a 33 year old 2B (138 OPS+).
# of 2B seasons over 135 OPS+ for a 2B aged 34 and above: 6 since 1950 (let's leave Nap and Hornsby and Eddie Collins out of it). # of likely PED-induced seasons on that list: at least 3 (Boone's 1 and Kent's 2). Robbie is a HOFer, but he's gonna have to keep showing that at an age when even HOF hitters fall off at his position in order for Seattle's MOTO to even reproduce last year.
# of DH seasons over 140 OPS+ after age 35: 25 (so better than Cano's odds) but mostly HOFers or HOF vote getters. Ortiz, Edgar, Molitor, Baines, Winfield... Cruz is hoping to be another Ellis Burks, who was a good hitter whose career wound down in the prime PED years. Cruz is not against PED use, so I'm not betting against him replicating last year just yet, but from an age-arc curve it's asking a lot. It was a really good year, as the song says.
To help those guys, Seattle has brought in... a bunch of OF scraps who can run a little. Dyson will lead off and Martin may bat 9th, meaning Seattle would be running 2 90 OPS+ guys out there against righties back-to-back for most of the game. It's not setting the inning on fire, but it's not ideal. As the Zduriencik defense-and-speed experiment proved, you have to be on base for your speed to matter for scoring purposes, and the other guys have to hit more than singles.
Seattle had a good offense last year, but it was precarious. I don't think it's any less precarious now, and if the balls aren't as bouncy (the home runs were excessive league-wide for a reason, IMO) then this offense could struggle to score.
Fingers crossed that this grab-bag of speedy defenders includes a couple of bats having up years at the plate.