Because it doesn't come off like an invasion at all, especially not to the crowd. It comes off like a homecoming - something I'm sure most of the wrestlers feel too.The brand invasion stuff is stretched about as thin as possible when literally every Raw/SD talent that has been on the show came from NXT, some of which didn't go up to the main roster until a few months ago, many of which were highly respected NXT champs.
They need someone to come in that'll actually get some heat as a non-NXT child.
fukk it, send in Tyson Fury to ruin the main event. That'll get boos. lol.