Miami can offer Whiteside more than any other team. Yes, they have to renounce all their free agents but they can offer 7.5% raises as opposed to 4.5% raises. Not saying they will, but technically they can, and he is obviously their most important free agent.
Since Miami doesn't have his Bird rights,
they can only offer him 4.5% raises.
*Edit - Correction: they have his Early-Bird rights - so they can offer him 7.5% raises. (However the early-bird exception only allows them to pay him up to $1.7M if they go over the cap to sign him.)
Here's a look at
Miami's cap situation:
Signed/Guaranteed:
- C Bosh, $23,741,060
- G Dragic, $15,891,725
- J McRoberts, $5,782,450
- J Winslow, $2,593,440
** $48M Guaranteed
Assuming the CAP is at $92M, that gives them $44M of CAP space.
Here are their CAP holds:
- D Wade, $30,000,000
- L Deng, $13,197,096
Everyone else is non-guaranteed, or minimum salary.
A team must have a minimum 12 man roster, filled out on minimum contracts, so if they only keep the 6 players noted above, there's a $3M CAP hit to reserve the minimum roster spots.
Since Whiteside is only a 4 year vet, his max salary will be about $21.5M.
$44M - $3M - $21.5M = $19.5M
Essentially, to be able to keep Whiteside, Miami would have to let everyone go on their roster with non-guaranteed salaries, including L Deng, and get Wade to sign for $19.5M or less.
Highly unlikely.