How come you claimed for years that it was impossible to fruit them in a pot? On internet you can find loads of pics with fruiting avocado's in pots.

And what is a big pot for one is a small one for others. Then we can still size up to planters.

If you use bigger pots i think the tree's will develop more sidebranches. They are very tall. Or maybe give them less N and less water? They will easy topple over now without support. But it's great that you got them to fruit so young!

Were they grafted tree's?

Even duriantree's can fruit in a pot but that's for the master gardeners.

I never saw a potted Avocado with fruit. It was labeled Steward so I imagine it is grafted.

https://www.google.nl/search?q=avocado+tree+container&newwindow=1&es_sm=122&tbm=isch&tbo=u&source=univ&sa=X&ved=0CCEQsARqFQoTCN6n-aKT4sYCFUPbLAodHNgKhA&biw=1366&bih=643

Yes i also think it was grafted. Well i hope they will be nice and don't drop.