"More likely than not" logically means with a probability greater than 50%. A probability of 50% would be "as likely as not". But the user of the phrase is not making a mathematically precise estimate of probability. They are expressing what they think is likely in an intentionally vague way, and it's misplaced precision to try to assign a number to it. As an opposite, one could simply say ...
To use the correct adjective with the phrase "in detail", think about fewer vs less in number vs amount - but remember "in detail" means specifically or completely already. Examples: I have read your question and answered it "in detail". If you want to read my explanations "in more detail", keep reading. You might find another answer that explains it just as well with fewer details (which ...
Just FYI, though, "more better" is pretty frequently used ironically these days by the hipsters and the whatnot to simply mean "better". Also, while I think no one would responsibly advocate this use, I think you could make an argument for saying "peaches are more better than apricots than plums are better than pluots".
What's more is an expression that's used when you want to emphasize that the next action or fact is more or as important as the one mentioned. War doesn't bring peace; what's more, it brings more chaos. Or your example.
How to use "what is more"? - English Language Learners Stack Exchange
What's the difference between these types of adjective usages? For example: This is more of a prerequisite than a necessary quality. This is more a prerequisite than a necessary quality. (without ...