In this FRC position Caissus Vs Me and IF i play 5...Bg7, then white can castle or not............?
Caissus believes that yes but i believe that no.

Since the following is valid:
To make a castle:

The king would not cross a square that is being attacked by an opponent's piece or it would not finish its move on such square.

And the King should pass across e1 that is being attacked by my Rook, in order to go on g1, then i find it reasonable that white CAN'T castle.........
But Caissus is an experienced player and perhaps knows better. Can anyone tell me what is the truth before i start playing again FRC............?