My top 3 most indispensable would be Goodson, Tracy, & LaPorta, in that order. Lindabaum would make the top 10, but no other OL or DB would because we have enough depth at those positions to plug and play without a huge drop-off. It's rare that Iowa has skill players who are truly game-changers, so when you DO have them -- especially at positions where there isn't a lot of other experience or depth as with Goodson & LaPorta -- it makes them very hard to replace.