Board Thread:General Discussion/@comment-25266931-20170206193307/@comment-27082610-20170211044709

Teen Detective: "Hi, I'm an obvious Mary Sue with experience and knowledge that people who have literally spent decades looking in to this exact matter haven't discovered!"

You not being a detective doesn't make it not a self-insert. The fact that pretty much everything else about him definitely strikes me as more or less identical to the way you talk about yourself also raises red flags in that.

This isn't a purist thing, it's a "this is a bad idea that wouldn't improve the series and in fact has great capacity to harm its pacing" thing.