I agrew ith what mongoos just said. You can lowball them in the 1-1.3m range and they will sign well before the end of coach hiring, assuming no one else is bidding on them.
As for rangerup's statement, Admin has specifically said that coaches don't affect performance, only development, so other than the bench coach strategy when your ML coach is ejected, I don't think it makes a difference in games. Either way, rangerup has no evidence whatsoever that his claim is true. Anecdotal evidence is worthless in this game.