First, I am addressing not just PhDeac but KitchinDeac comments as well.
Yeah, 4 years after his rookie deal, then he can start making the big $$$$. Plus you have to assume that he makes it in the NBA to deserve a big deal on his 2nd contract. Look at Johnson and Teague who were drafted the same year 16th and 19th. Both could have benefited from staying at least another season. Now, Johnson is a bust and only making $2.5 million the next few seasons which is less than what a lottery pick makes; where as, Teague is decent starter, made 1 All-Star Game, and is now making $8 million a season. What happens if Collins is bust similar to Johnson (I hope he doesn't)? Then that extra $6-$10 million from his rookie deal becomes much more attractive.
If you were referring to the 3rd & 4th year team options, then that can go as high as 120% to the base salary in his draft slot. Kyrie Irving only made a little over $7 million in his 4th year in the league after the team option was picked up for the 2014-2015 season, and he was the #1 overall pick.
http://www.spotrac.com/nba/cleveland-cavaliers/kyrie-irving-8051/cash-earnings/
My point was only to show how much money Collins would make if he was drafted in the 14-26 range this year compared to what he could possibly make if he stayed 1 more year, improved his draft stock, and was drafted next year in the 4-14 range because the dollar amount of NBA Rookie Contracts are already predetermined according to the draft pick. I wasn't trying to get into debates about hypothetical situations that could occur to him once he is in the NBA.