The analogy between sekirei and pasocons is rather shaky, beacause so far I have seen no competition against humans in sekirei, and for pasocons almost the whole anime turns upon such. Heck, sekirei are mostly human. Unless we look at Yumi and the trauma her end dealt to Ueda (versus flashbacks of Yomi that Minato keeps having), the general dynamic is different entirely. Most importantly, pasocons are not supposed to fight.

I think the biggest link so far is the widow who runs the place. Notably, their husbands were researchers of sekirei and pasocons respectively.

UPDATE: Forgot to mention, I knew that animation in Sekirei after the ep.01 wasn't bad at all. Seeing screencaps of Chobits only confirmed it.