I think that Aizen got his hands on the existing arancar, and he's improving them.
Plus he had lots of menos grande, and what looked like a super menos grande serving him.
There may be a hollow-lord but i doubt we'll see it in this story arc.
... that means that any regular hollow that comes around Karakura, will only be there to be killed by Ichigo's little sister and that lot, unless it's a one scene shot of someone extinguishing a hollow(like Ishida used to)
... Ishida coming back at less than his ungloved state, would probably be a waste of time, since the weakling arancar were as strong as the captains at full power.
As for what Ryuuken will say... probably that it's okay to be friends with Vaizards(as if)

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