Could be both. This might be the best moment for Denji. Back in chapter 97, the final chapter of part 1 the rumor was that Chainsaw Man only saves girls lmao
and then recently on the news, in chapter 99, we were told Chainsaw Man has not yet appeared this week
I think this might be the time for Denji to debut. Saving Asa and Yuko from the Bat Devil and creating an internal conflict between Asa and Yoru since he now saved her life and her friend's life. Plus it's been like 4 chapters and we haven't seen Denji at all.
Though I wouldn't be surprised if it's Yoshida that pulls up. Could be a good bonding moment for the trio.