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French's upside might be higher, but his probability of being worth anything at all is close to zero if he cannot pitch more than 4 innings without imploding his velo and break. He's damaged good.
I am much more interested in starting pitchers who can give me 7 quality pitch efficient innings even if they don't overpower people because with THIS park and THIS defense, those are the guys you can bag for cheap and then bank 200 4.20 ERA innings. I'm running a Cardinals' style pitching staff if I'm in charge of the Mariners. bag an ace or two and then fill in with rubber arms who throw strikes.