He is not totally wrong.
I get this is a flashback, but this is God Valley.
The "marineford" of the old generation and the oppening so far is "good" but not on same level as the oppnening we got in Marineford.
We have so many top tiers in god valley, so many devilfruit users, for that a island like God Valley seems be to small.
Hope we see good feats and drawing, not just "lightning" clashes...