True, but we are talking about the power of King Thor mixed with power cosmic.. perhaps the sum is greater than the parts? Will have to wait for the next issue to see..
I would say a better opponent would have been Franklin Richards. Galactus has recently been shown to handle a prepped armored Odin and Thor without going on the offensive.
Against Thanos Galactus was shown possible in need of a weapon even which he didn’t get a chance to use. The only other time I recall Galactus using a weapon vs an opponent would have been vs Abraxxas. Thanos looks well above a King Thor Surfer combo with what he’s accomplished imo.