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my friend proposed an IC can join a carinfex, on closer inspection of the rules they are ambiguous of the matter, to quote straight from the book "they cannot join units that conist always consist of a single model (like most vehicles and monstrous creatures), does the fact that a carnifex does not always consist of a single model, there can be up to 3 in a unit. and that by saying "most monsterous creatures" it admits that there are exeptions, mean that an IC can join a solo or group of fexis?

ICs can join either, since a Carnifex is not a unit that always consists of a single model.

Is a Carnifex brood a unit that ALWAYS consists of 1 model?

The following deals with MC's without the IC special rule.
Most MC always consist of 1 model (I.e. the Avatar of Khaine or the Harpy).

AFAIK the only two MC's that are open to debate on whether or not an IC can join them are The Swarmlord and the Hive Tyrant. This is due to the unique ability of the HT to join a unit of TG as if it were an IC.

Oh now I have to reread the Rulebook...would love to join Imotekh to a unit of Spiders...

You can indeed do that.