okay going back to what Lucci said some time back, forgot which chapter, Zoan type are best at closer range, and get stronger as that person trains. Bases on this, you can assume it possible that Zoan type can eventually get stronger then logia. I expect paramecia tyoe works the same way, (with diffent type of training i guess)
Logia from the look of it is just Insanly powerful at the moment you eat it. However, from the looks of it, the chances of one progressing that power further is pretty low. So Logia will not, get any stonger then they already are.
taking this into account, the strength of logia type is not depended on the user own pyshical ability. Also I expect it will be rare for paramecia and Zoan type user to surpass Logia, but not impossible.....Enter Luffy. Unlike logia, Zoan and paramedia still can grow.
edit: forgot to add this in.
Logia : powerful but no potential growth.
Zoan : potenial lies mostly in it user pyshical strenght. (I think) And some in techiques
Paramecia : Potential lies in it (mostly) techniques and some in pyshical strenght.
Some how I'm unbanned.... Yay!
But my wonderful waterfall sig is gone!!! Do you have any idea how much time I spent on it!!!
~They call me the Master Researcher~