Of course, 5... Bb4 is a substandard move, Be7 or Nbd7 seeem better and 6.... Bxc3 is terrible, Qe7 makes much better sense if you're going to play Bb4.
Yup, Be7 was played by a Grandmaster, bxc3 is bad because opens up the file for the rook. is it possible to post videos here? I will post a series on this gambit.
This is a nice opening you can play as white