Board Thread:General Discussion/@comment-10266932-20130531151056/@comment-11051098-20130901002516

If Ichigo had enough time to learn to master Tensa Zangetsu, then perhaps it could become stronger than Yamamoto's. But I think it would take many, many years.

If Ichigo in his Shinigami/soul form would get a "normal" Shinigami lifetime of kinda 1000 years or so, he would probably have the time needed to fully master Tensa Zangetsu.