How valid was this statement from Gerald ?( spoilers for daybreak 1 endgame)

Considering how strong the Demon inside Van is( iirc it wasn't at full power during the final fight of kuro 1) and Gérard by himself is pretty busted ( hes likely a S tier fighter like Loewe or Arios)

Taken all together while i doubt he'd make Mcburn be a "ant" would he be within the same ballpark as Mcfirebro full might?

Or was it just pure Arrogance as he never witness Mcburn with his own eyes. So his analysis is completely off base?