"On the Rays side of things, while Alvarado is probably talented enough that a contender should want to keep him, Tampa had other fish to fry. They needed to clear a 40-man spot to complete the Snell deal, and this did just that. Plus, the Rays have shown an ability to materialize relievers out of the ether on a monthly basis, so dealing from this area from the roster is far from egregious. There may be some salary reasoning here with Alvarado reaching arbitration, but I’d give them the benefit of the doubt."
MLB Roundup 12/30: Rays trade José Alvarado to the Phillies
Another day, another Rays trade.
To some it up, needed space so that they could complete the trading of their ace, deepest position group, cheaper option. Win win situation for the Rays.