Well, like I said, the game plan was clearly to ride the bullpen. Since he was not able to get a good game out of Glasnow, it's possible he decided to change his strategy for game 6, when his back was up against the wall. What are you saying - that he has to use the same strategy every day?
And really, we don;t know how much of his "twice through the lineup" plan was based on conversations with Snell, or what he felt he could get out of his pen, or possibly even his desire to use Snell as an emergency reliever the next day.
The bottom line is, none of us really know everything behind why Snell was pulled.
And leave Snell in or pull him out, the Rays only scored one run and were shutout the final 8 innings. THAT was a much bigger factor in losing...