A common theory is that if BYU got the best LDS talent, BYU could be a top 25 or better program. I'm not familiar with all of the LDS talent out there but I don't believe that BYU is missing out on a ton of LDS talent, at least not those serving missions. If you could add anyone to the team, who would you pick?
The only one I can think of is Britain Covey.
I might want to include Francis Bernard or Tolutau as well but you could argue they already had their chances.
There may be a few others at Utah or Utah State or Virginia or Stanford but I'm not familiar enough with their rosters to know for sure.