Hader's going to get paid better than Diaz, so no point in fantasizing about him in a Mets uniform. I doubt Timmy Trumpet would be willing to tune it up for the 8th inning anyway.
Yamamoto is a no-brainer for the Mets. Senga sure worked out fine, and this guy had better numbers and is younger. Or you can overpay for 5 innings of Snell every 5th day for 7 years. I'm not a big believer that this is an awesome FA year for pitchers, but if I had Cohen's money.....lol
Either way, it's an uphill climb in that division, especially if you trade the polar bear. Of the guys who will certainly get overpaid, I like Montgomery the best. For one Snell or Montgomery, you could probably get Wacha, Flaherty and/or Martinez.