how many plants in a 5 gallon?

I had a issue with some aero units, and need to switch some plants over asap... i lost two super lemon hazes overnight and a A-train is about to pass as well..
so heres the question... aside from 4 full grown plants 3 weeks into flower, i also have some younger ones about to be sent to flower i want to switch over too so i don't have this issue. (and yes i know what the issue is, the nozzels are getting clogged too often with the humboldt line) anyway i am going to make a few quick flood and drains from 5 gallons and i need to know how A: how many already full grown budders can go into a bucket?
and B: if i started out clones in a 5 how many can i fit in for a full grow (3-4?)

i know the 2-3 gallons per plant rule but i was wondering if hydro fell in a different bracket since most of us use a 5"net pot or less...

anyone? just want to make sure what i can get away with and what is pushing it.....

All the 5 gals I've ever seen had one plant.

yeah im not talking about what is realistically the best.. i am trying to figure what i can get away with and still be successfull.. i only run 2 week veg to flower, so my plants aren't in there for 3+ months.

1, sorry if it is not the answer your looking for but it is the truth.