Just as a friendly note of warning, if you are currently watching or aiming to watch Hazbin Hotel, now on Amazon Prime Video, the following addendums apply...
#1: Um, what are you waiting for? Go see it, it's awesome, support the official release and all that good stuff, just be aware it is for mature audiences only, if you didn't know already.
#B: You won't want to read any further, because this is the section of the old-timey-blog-map that bears the legend, HERE THERE BE SPOILERS.
and Point the Third: Comedy comes in threes, baby!

So you have been warned. If you get spoiled from here on out, that's on you, dawg.  (Note to commentors, please use spoiler tags, just in case  I ain't gonna, cause this here is my bloggity-blog, see?)

Here's my thoughts....

Lucifer is the original Fallen Angel... no one in Hell can kill an angel, so Lucifer is de facto the strongest being in Hell because he is invulnerable, not necessarily because he has the most power. Although, yeah, he probably has power out the wazoo too, given that he has existed since the dawn of time... but that's a discussion for a different happy day in Hell. Even Sinners as powerful as Alastor has shown himself would be unable to take Lucifer out... except now we know there is a way to kill an angel. More importantly Alastor now knows it as well. He might see a way to get all the way to the top of the foodchain, as it were. A chaotic situation like an all-out war with Heaven would be his best chance to kill Lucifer and pin it on Heaven and the angels during the confusion. Thus he takes the throne and keeps himself safe from any reprisal from, say, a certain Princess of Hell...

He wants to end the Status Quo, after all, and what better way than to take out the Big Little Man himself. (You'll get it if you watch the show ) It also might be why he told Mimsy to beat it, to keep Charlie thinking he's there to keep the Hotel's Redemption Project going, and prevent interference. 

So, waddaya think? Do you think Alastor is scheming what I think he is scheming? That he is scheming something is without question. He's had a hidden agenda since the start, and now he might have set his goals even higher since gaining this new intelligence.

Stay sunny side up, everyone!