muscle plication as a revision? Should I expect the " bulge" to be resolved after revision? Will this be successful?

I had hernia repair and tummy tuck one year ago. Still have muscle separation/ Diastasis recti in upper belly, which still bulges out above lower. My PS confirmed this. Is offering to re-do plication in upper belly with another, smaller incision above belly button. Can this still be done successfully without re doing entire tummy tuck surgery?