Who is the strongest espada?

Answer 1

starrk is the strongest at the start when we see him, but we later discover the #10 espada is really #0 in his realese, but ulquiorra has a second form called segundo etapa which is really sick.

Ichigo did not fully win his fight against Grimmjow for two reasons. Reason 1 is that without Orihime's plead, Ichigo could've died, and reason 2 is that at the very end of the match, Grimmjow was still standing up to fight, but was terribly interrupted by Nnoitra, the 5th Espada. Yammy in his release state becomes Espada 0, and the more angrier, the more powerful. Espada #8 cheats using the battlefield and minions in combat. Espada 4 in his segundo etapa is able to use a green spear called Lanza Del Rampago which is cabable of destroying a small city.

actually ichigo did win the fight because grimmjow never really killed ichigo that was ulquiora. its pretty hard to determine who is stronger because ulquiorra has segundo etapa, Yammy has a 2th form too, and stark was able to fight 2 vizards and two captains.oh yeah and halibel was fighting 2 vizards and 1 captain. i would say ulquiorra and yammy would be a tie as #1 because they both have 2th realese forms and devastating ceros.