Board Thread:Questions and Answers/@comment-7628840-20130330192013/@comment-957629-20130330192419

That's a pretty subjective question, strongest as in how?? Physical Strength?? Reiatsu??

Not to mention he hasn't been shown to have battled against every character in the series!!

The only way this would ever be confirmed is if Kubo, the creator, came out and wrote/states that Hollow Ichigo is the strongest Hollow!! But he's not even a Hollow, he is a part of Ichigo's powers!!