“In colts circles” doesn’t mean Nick Underhill. I believe he was probably an option if the matt Ryan trade didn’t go through before his bonus deadline of 3pm. And they probably wanted to get him up there to have their doctors look at his knee.
Denial ain't just a river in Egypt. You already said your "colts circle" was Colts fan message boards, so yeah, I'll take Underhill at face value over randos who were still hoping Luck would somehow come out of retirement.