So, I think we have to look at how players can achieve 2 wins at the 3b position. And then ask ourselves - can Matt Shaw do that? For our game, I'm going to use Josh Rojas, who clocked in at 1.9 fWAR over the course of 143 games.
Josh Rojas finished last year, in 436 PA's, with a 91 wRC+. He was 20th out of 29 (using 400 PA's as a minimum) in base running value, while finishing with a +7 DRS and a +5 OAA.
I think Matt Shaw, over a similar span, probably gets to 1.9 fWAR with a 97- 1`00 wRC+, and then flips Rojas in that he is a positive base runner (he's quick fast, steals bases...) and loses that value back on defense. Can Shaw replicate that line? Well, he's absolutely smashed every level he's been at - he finished with a 142 wRC+ last year in Triple A,. He did so with green flags such as his contact rate and his ability to hit velocity. Yes, he struggled with sweepers over a limited sample, and the leg kick is funny looking, but we're short of seeing where the leg kick has hampered him yet and sometimes guys do things funny-lookin'.
For a comparison, PCA finished with an 87 wRC+, but was much worse at Triple-A. He took double the PA's but was a league average Triple-A hitter. I don't think expecting Shaw to finish with a wRC+ 10 points higher than PCA seems wild - especially with improvements on his approach.
I don't think Matt Shaw has nothing else to prove. But I also don't think a pathway to 2 wins is particularly insane. It feels pretty median - in between the best case and the worst case.
I'm all for finding him some help. Give me a Rojas or something that gives you a floor guy incase of injury or face-planting. But I also think he's pretty "green-flaggy" when we look under the hood.