Quite a few are underselling Deb's ability. I don't know what it was about Deb but alot of younger, thinner women underestimated her ability, maybe it was her perceived age? But regardless, this resulted in a lot of matches where Deb wiped the floor with her opponents. That is not to say she was lucky. She knew here advantages and used her weight and always tried to immediately get gravity on her side and kept up the pressure by going for the head. And keep in mind, against all ages and sizes, she never lost a match AFAIK.
I don't remember Michelle's ht/wt range exactly, but I feel she would have a tough time with Deb, it wouldn't be one sided one way or the other.