How crucial they were is debatable. The WPA value of those outs wasn't anything notable (kind of generic outs). If you feel those were the two most important outs of the game, that's an opinion I do not share.
And Cash went to his top relievers when Snell left and they gave up runs. So if Snell isn't going a full game (and he's guaranteed not doing that), those same guys come in and the Dodgers touch them up. You can make the case for going straight to Castillo, but the Dodgers got to him too earlier in the series. The best case scenario for the Rays is Snell leaving at some point with a 0 on the board and the Dodgers getting to take their hacks against a bullpen that wasn't able to contain them.