Im not sure cause i never checked but you mite be able to check the cap space to see where he went(not sure tho) other than that you wont know until the FA period is over...
as an alternative....you could just make the offers to all the elite FAs at the same time b4 you adv any time in the FA period..for example have Miami offer contracts to Wade, Bosh, and Lebron....but also have Cleveland offer contracts to Lebron and Bosh and Amare...etc...then just sim the entire period....either way your not going to know until maybe where you spend points or preseason....
or whatever works best...to me the most important thing is making the decision as random as possible while making the possiblities as realistic as possible....so like i said i just try to make the right teams with the need and the money offer the contracts then i get out of the way of the process and let the "player" make the decision...
as a note this is my 2nd Association..i had 1 with player roles and chemistry on b4 i realised they didnt work properly....D.Wade left Miami for Chicago(for the less contract) and Bosh went to NJ...Bron Bron has always stayed in Cleveland