User blog comment:Neowitch/700 - Breakfast at Mugiwara's/@comment-1454981-20130227135301/@comment-3425840-20130228161914

Shiki's and Roger's respective crew battled and since Shiki had a humongous crew he could match Roger, not necessarily mean he could fight Roger alone. Also if Shiki is that big a shot, then why did the marines sent only a handful of Vice Admiral to take care of him on Strong World? (His body was found by some five Vice Admiral who were on the way to subdue him) They could have at least sent a couple of Admirals. They gathered all their forces as well as the Schichibukai to confront WB.

Also if Garp could fight Roger without devil fruit why does Roger need devil fruit to fight Garp? And if he can fight Garp he can fight WB as they are roughly close in strength (WB a little ahead but only a little).