Teenage doubles turn into mature-man homers, but singles stay singles. So it's all gonna come down to those hits for me. If Marte can hit .350+ in his prime they sure, bring on the Rod Carew comps! Except Rod took walks, of course. I think Marte's gonna hit .260-.285 for the next few years with the potential of a .300-.310 caused by a BABIP spike. In the minors, BABIP is more like .325 than .300 because of poorer fielders at positions they will not play in the bigs (if they get there) and no positional scouting or informed shifts.
Ketel's minor league BABIP is .327. His time in Tacoma? Around .360. Did he start hitting the ball with more authority then, the way Ichiro did throughout his career? I don't think so, but it would be good for him if he did. It's a year and a half of good BABIP luck in AAA and the bigs, so maybe it's not all luck at that point.
I don't know what the old-timer BABIP models looked like, but Ichiro has a career .340 BABIP and Edgar posted a .335. Shifts weren't prevalent then, and you couldn't shift Ichiro or Gar anyway; they'd just go oppo and embarrass you. Marte currently is posting a .335 BABIP as a big-leaguer. I don't expect that to last. If it does, I'll be fascinated to see what he does and can agree with you throwing his name around with those semi-facetious upside comps.
But if he has a normal BABIP coming his way, as he had a normal minor league BABIP, then there will be some regression afoot. He has the quick bat to make it a legit possibility - but I'm still gonna make him show me before I buy in.