Okay I'll be honest, I might be lowballing here since I don't recall every detail of And You and don't have time to re-read. IIRC what actually happened was that Orologia forcefully created (or branched?) a decilion actual real timelines that were all contained within himself/his personality, which he had to dip into the Boundary to get that ability from. But at the same time, he's not so above the baseline with just this feat alone because he was also getting corrupted by the influence of these timelines that were trying to break out of his sphere of influence, and were actually succeeding. And it's not like he could just straight up create the timeline he wanted, hence the event. (I'm of the opinion that Orologia can just induce branching, but there's also apparently evidence that he's actually creating those branches instead of relying on natural timeline branching for it)
Orologia also can't mess with the Omnipotent's Laws on "free will" (which isn't actually free). You also have Lucilius whose Providence power is directly above Orologia's causal manip (literally deleted the primarchs from multiple timelines around Versus while Orologia has to be sneaky with manipulating events), even though we don't see Lucilius creating a decilion timelines in comparison.
Unfortunately I can't write a completely comprehensive analysis on this due to ignorance so I'll leave it to Jedi for later.