He is set to count over $10M in both 15 and 16.
If we June 1st him we will have about $5M extra power year to sign his replacement.
Finding a replacement FA for $2M should not be to hard, that leaves $3M extra per year to spend elsewhere (read replace bell). If we use a 4th rounder the extra jumps a million.
While Kalil is good and will be missed, the reason centers are not payed premium (unless hurney is involved of course) is that the step down to just a dud is not that big.