User blog comment:Skyblade743/SFW Summer Awards - A Wild Skyblade Appeared!/@comment-32712012-20180727230652/@comment-32712012-20180802235017

First of all, I'm glad that you understand what I said so far!

Now, as to why Mephiles is helping Silver:

Note: Spoilers below.

The twist for anyone who's familiar with the plot of '06 is that Mephiles actually isn't interested in fusing with Solaris. Silver thinks that at one point ("DOES HE WANT ME TO KILL SONIC IN ORDER TO RELEASE IBLIS?"), but, in reality, Mephiles's one true goal all along has been to help Silver and the dimension in general. As Mephiles says to Silver near the end of Cosmic Reboot: "You're determined now, more than you've ever been and more than you'll likely ever be. You're channeling that against me now, but you'll channel it against Infinite and Iblis soon enough. Had you not gone through this, you'd never be determined enough to really save your world. Aren't you pleased, Silver?" This is really why Mephiles does everything in Cosmic Reboot: why he teleported Silver to the past, why he tried to get Silver to keep chasing Sonic even though he knew what would happen to Sonic, even why he killed Sonic in the first place long ago. As he explains to Silver later in that same scene: "Had I not released Iblis, your world wouldn't be bad enough to make you save it. I saw your world without Iblis. Just as bad in my eyes, though it would have been better in yours. You never would have saved it. Infinite would have seemed weak to you, too weak to bother with. [...] You'll take Infinite as a challenge, now that you feel you NEED to take him down. If he wasn't so seemingly powerful through Iblis, you'd feel like it wasn't fair, and you'd never take him down." I hope this explains why Mephiles is interested in helping Silver and taking down Iblis. Sure, there's no particular reason to believe that what he's saying is true, but given that, like you're saying, he doesn't try to fuse with Iblis when he'd have every chance to do so, I'd think that what I just dredged up as evidence is more likely to be true than what you're saying.

Spoilers end here.

Does this make sense now?