I'm inclined to agree with
@Perfect_Drug here. They might have core players locked up but the first comparable an agent will look at is who is on the team and their salary relative to performance.
If Broberg or Holloway don't pan out at their respective cap hits, they will be setting the table for overpaying homegrown players
IMO fans overplay the "offersheets don't happen because old boys club" mantra. It's more that they don't happen because you have to overpay a player to entice them and it's incredibly risky in a cap world.