I actually liked this chapter. Jigen being related to the jubi and to the Otsutsuki makes sense to me as well, as there was no other way to justify the introduction of new foes so strong out of the blue. However, I still remember how badly Kaguya ruined the manga. Kishimoto really had a mental breakdown at the time, and he suddenly replaced Madara and Obito (introduced so long ago in the story) with a new character nobody cared about, just to defeat her in 4 volumes
. Furthermore, I hoped for the explanation of the Kaguya clan (you remember Kimimaro? Orochimaru's favorite subordinate), but Kishimoto most likely just went numb, I've lost all hopes and expectation for him, I'm not interested in his new storie at all.
As for the Kara dude resembling Jiraiya, I think he's actually looking for someone who can oppose Jigen, that's why Jigen and the old scientists made those comments in the previous chapter. After all, he's too interesting as a character to be left in Kara instead of making him switch side.