Wouldn't James get more than Bosh?
As far as I know, no, not in the first year, although I may be wrong.
Can't you sign your own players to a bigger contract than other tean's players?
Yes, you can give them contracts with 10.5% increases, instead of 8%, and going to 6 years, not merely 5.
if they are able to dump both Gibson and DWest (something they would have to do before Bron reups)
It's not difficult to dump West. His contract is only guaranteed in 10%, $400k or something - they can merely release him. They have space to keep Gibson if they wish so, but do you really think they'll have any trouble to dump him?
are able to sign Var for 7 mil per (he's opting out on close to 7 by the way)....
As Fanfir said, he's going to opt out to get a long-term deal. They can offer him a $46 millions contract and he would be making $6.5 millions in the second year.
personally, i think the only way they have money for two max contracts is if they don't re-sign Var....
There's no reason to think that.
That said, I believe their priority will be to acquire the talent via trade and keep on operating above the cap.