I think its a mistake to think its the individual players. Regardless of whoever we bring in, they will probably get injured. Thats the Mets way. The team struggles with diagnosing injuries, injury management plans, injury prevention plans. For all we know, the doctor struggles with the procedures, as well.
I'm not against bringing in a pitcher, but as you said, Alderson doesn't really like spending on free agents, probably isn't all his fault though, I doubt he is given much by the Wilpons. If we are spending on a pitcher though, spend big on someone who's good, and that can be it for free agent spending. I don't want a #4 or 5 starter. Go get Ohtani or someone like that. Unless a player is injured to begin with, which usually doesn't happen before the season starts, why would I hand a spot to inferior players? I don't think it makes much sense. We have 5 starters better than these dime a dozen SP's, the problem is just that they are never healthy all at the same time. Should we just assume certain players will get injured?
Its a tricky spot to be in. I'd be cool with like a 1-3 of Syndergaard, Ohtani, deGrom, and then Wheeler, Matz 4 and 5. Gsellman, Lugo, Harvey 6, 7, 8, but I am certainly not giving a Bartolo Colon level pitcher a spot in the rotation just because he's not dealt with the Mets medical staff the last few years, like all our SP's have. Thats accepting worse performance because you are assuming injuries. I just don't agree with that logic.