I think Brogdon is a guard, a combo guard who can play a little bit as a SG, but I don't see him playing as a SF (ie a Forward). Maybe. Teams play with 3 guards these days and the Knicks may do that, but Brogdon will still be a guard. I see Hart and Bridges as more forward-like than Brogdon.
This could be a sneaky good signing. Brogdon's biggest issue his entire career has been durability. But he is a good player and only 32. Rookie of the year and 6th man of the year. I think on a good team (which NYK should be), in the right role, with his minutes able to be managed, that he will be a significant plus for the Knicks.