Does the 3 leafs mean anything? I was told once it gets 3 leafs it's hard to bring back also?
No it's not hard to bring back. Some plants might be a little more resistant to it than others. Even different plants of the same strain. I've revegged after harvest just by leaving a few budsites.
My coolest reveg was from a mainlined plant from seed. I loved the plant and it was the best producer in it's batch. I chopped all of the colas but left budsites on the bottom of each one.
It left it on 24/0 for 10 or so days. She was starting to produce the round smooth leaves.
Popped her into 18/6 and then into gas lantern routine until she went outside.
Talk about bushy.
Rigged up a net for her for an outdoor scrog.
a 3x3 was filled up in just under 3 weeks.
Reveg is easy though. Just takes time and it depends on the plant in question.
You'll get quicker results using decent lighting.