There's been a few things that I think are wrong posted in this thread in the past ~2 hours. Black holes, violating laws like conservation of energy, and how powerful CO would be after combining.
On black holes, no, this won't turn into a black hole for being larger than 4-C. Black holes are created based on density of a mass/energy. When this thing gets above 4-C it will be through duplication, meaning that its size would increase 10^30 or some ridiculous number of times as well. Even if it fuses, biological fusion doesn't work that way, all of those pieces would just be attached together functioning as one entity, rather than collapsing down into one entity the size of the original.
On violating conservation of energy, everything about this profile already violates multiple physical laws. The idea of putting biological functions of smaller creatures on larger ones violates the square cube law. In reality, a being with these sorts of powers could never exist, all of its abilities would be greatly nerfed as it grows in size. A video explaining what would happen in reality if we took small/large animals and changed their sizes can be found
here. If you want only stuff that's possible in reality, this would be impossible, as well as taking an eternity to actually figure out what the **** it does, e.g. you can't just combine poisons and get their combined effects, etc. To downgrade this profile for not being possible in the real world, you'd have to strongly downgrade every other composite profile. CH can't know everything every human has ever known, that much information would make their brain so dense it would literally collapse into a black hole, combining abilities doesn't work since biologically those abilities need a certain amount of space for dedicated channels to go out through, I could go on for hours.
On being twice as powerful after combining. If I am myself, I can punch with X kilojoules of force. If I clone myself, we can both punch at the same time, creating 2X kilojoules of force. If we staple our stomachs together, we can still both punch at the same time, creating 2X kilojoules of force, however, we will be ~2X the size that the original me was, with only 1X the durability (as durability is force required to damage, not to kill).
