Little's curveball is arguably MLB's nastiest pitch and he's one of MLB's best leverage relievers. It's downright asinine that you would be complaining about using him in a close game against a division rival.
Gausman is probably the team's most important rotation arm, and the extra rest he received prior to this start was likely a massive contributing factor to how effective he was. He's accumulated a lot of mileage on his arm, and after he produced a stellar 7 inning start there was no reason to push him further as the team has a very solid leverage group in their bullpen and only needed to produce 6 outs. Sooner or later you'll be forced to admit that the manager, pitching coach and front office are far more knowledgeable about how to run a pitching staff and manage a game than you are.