Agreed. Chances are that Jiraiya isnt going to be ressurected because his body is in the ocean. The bodies are needed to use that ressurection jutsu Kabuto and Orochimaru uses. (remember in the anime in the filler where the 4 Fire Gaurdians corpses were stolen and ressurected?)
With that being said my question is how the hell did Kabuto get some of these bodies. Some of them were buried in there respected villages like Asuma. Kakuza was in the leaf's autopsy.

How did Kabuto get all these ninjas?!
Well anyways, like i was saying, chances are Jiraiya's body was recovered by Kabuto anyways (this dude got a giant swimming snake. So its possible) And if so Kabuto is saving it as an ace or it hasnt been revealed that he summoned Jiraiya yet.
We cant assume that the people that we saw ressurected are the ONLY peoples ressurected. I think theres alot more familar faces we'll see. Some faces we wont know but the ninjas fighting them will know them.
Btw i won't rule out Kushina or the 4th Hokage being ressurected also. Kabuto is freaking smart and theres no telling what other tricks he got up his sleeves. I don't think we'll see the 1st or 2nd or the 3rd and now that i think about it yeah not even the 4th because all there souls were sealed by the demon seal jutsu. (The 4ths soul was sealed when sealing half of the 9 tails chakra and the 3rds was sealed when sealing the 1sts, 2nds and Orochimarus arms)
sorry if i got off topic. lol