Pretty simple and nothing to do with total wins. We needed a someone who could lead off, someone with a decent OBP, and he had to play CFer as it's the only spot where no one would be blocking anyone of even remote relevance. Jay checks every box there. The fact that hes a stop gap doesnt hurt as we do have some interesting CF prospects, just not now.
If Adam Engel is your every day CFer, Renteria is not batting him leadoff. Moncada and Anderson hit lead-off in 135 games last year....something they should never be doing basically (Anderson especially) and wont be on the next successful team. Jay relieves that and places two of our more developmental players into more proper roles.
If we spent a million or two too much on him, who cares? We weren't spending that money anyways. The more egregious overpays were pretty much everyone else added. No one should care about that kind of money or the blocking of Adam Engel