Don't need to? We're trying to win a world series. That's the need to. It's neither silly nor short-sighted. It's the whole point.
I'm not thinking about down the stretch next season, we're in the playoff hunt this season, who knows what next season will bring. Deal with it when you get there. If he's dominating in the playoffs, nobody anywhere would be complaining about AAA innings. Who knows how well it might actually benefit him? Who knows how much it might have benefited us? Nobody knows because they didn't try.
We would only keep him here if he was succeeding. Having our major league coaches see him in this environment first hand would also be useful. If they could see he wasn't quite ready, just send him back and carry on with the offseason plan. The kid will be fine. It won't hurt him any. Throw him in the deep end for a minute, maybe he'll swim.
He may be the second most talented pitcher we have at our disposal after Gausman and we didn't even take a look at him. 6'4" lefty with serious strikeout stuff? Thank you very much, I'll have another, please!
Be aggressive, take a chance on talent. Try to win a championship. Any thought that this would somehow be detrimental to his development I think is way overblown. When you put the upside on the scale versus the downside, the upside breaks the scale.