Legacy certainly makes it seem as though Kevin died. Emphasis on the seem.
There's all sorts of excuses one could have for using Bridges again. Kevin still alive, an echo of him in the system, another Clu or Clu-like duplicate...
I've heard people speculate that Ares exits from the original grid from the first film, as opposed to Kevin's new grid in Legacy. If they go that way, it's not a bad way of doing a non-sequel sequel. You can be a not-a-sequel to Legacy without contradicting it. Like, those events happened...we're just not dealing with them here and now.
There's all sorts of excuses one could have for using Bridges again. Kevin still alive, an echo of him in the system, another Clu or Clu-like duplicate...
I've heard people speculate that Ares exits from the original grid from the first film, as opposed to Kevin's new grid in Legacy. If they go that way, it's not a bad way of doing a non-sequel sequel. You can be a not-a-sequel to Legacy without contradicting it. Like, those events happened...we're just not dealing with them here and now.