User blog comment:Soulreaper1234/Is Vasto Lorde the 10 Espada or just another Hollow Being of higher capabilities?/@comment-1769234-20100607201910

My opinion on this is that if any were Vasto Lorde it might be Espada 1-4.

My reason for this.

1. Starrk he was killed by Shunsui Shikai, but some forgot that Starrk was also in battle even if only for a short while with two Captain level Vizards Love and Rose and Captain Ukitake of the 13 divison.

2. Barragan was killed by his own power turned against him by Hachigen's Kido barriers. Soifon did battle him but didn't prove that he could be beaten by her alone. Soifon could be more of an average captain in terms of spiritual power as with spiritual pressure level her's is great spiritual power not immense. As stated that great spiritual power is most common in average Shinigami captains.

3.Harribel did fight against Toshiro and he kind of held his own against her, but ulimately she was killed by Aizen someone with at least twice the spiritual of an average Shinigami captain.

4. Uliquiorra was killed by a Full Hollowed Ichigo, as before he was in that form he could do almost nothing against him in his first Resurreccion and was nearly powerless in his Resurrecion Segunda Etapa. Side note the shilioutte that Toshiro gave could have been Uliquiorra before he was an arrancar.

Also the rule that Espada ranking 1 through 4 cannot release their Zanpakutos in Los Noches as their releases could do great damage to Los Noches, that could mean that only Vasto Lordes release's fall in that category son the ranking of forbidden release could rank from none to all of the Espada or to a few of them.

These are all my theories with facts from their past battles before they were killed.