Kd2 is better. 6. Kd2 Bxg4 Be2 or Qe1. Either way the queen's fine.
I do agree with you though, bluestone. 5. g4 isn't the best move for white after Bxf5. It works better on move 6, like I said earlier.
The Bluestone Counter Gambit
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they look it
but I would play g4 first then develop