I am not sure what you mean by bound. If you are referring to the hedron rings that held them in place during BFZ, I would say no. Premending walkers had near godly power, and while I am sure they were restricted in some way, it was more likely it was through some sort of spell cast by one of the planeswalkers. I don't think the topic was explicitly discussed by wizards tho.
December 5, 2017 6:41 a.m.
Eldrazi were first imprisoned on Zendikar before The Mending by Nahiri, Sorin, and Ugin, and they used hedrons to trap them.
December 5, 2017 8:01 a.m.
By trapping the eldrazi's physical presences, Sorin, Nahiri, and Ugin trapped the essence, as well. They couldn't unleash their real power because the hedrons were crippling them.
December 5, 2017 1:38 p.m.
Hyperalgialysis With bound I mean their 3-dimensional forms (the "hands in the pond"), and with unbound I mean their true forms from the Blind Eternities.
ZendikariWol Ah, I think I get it now. I didn't know if they could still manifest in other planes even if they were trapped in Zendikar. Thanks for the answer.