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Looked around a bit and havent found a ruling on this, I have read some tactica on tyranid primes joining carnifex so is it possible for eldrad to join the avatar ? Tks in advance

Only if they are not always a single model unit.

i.e. carnifexen can be bought as a brood of up to 3 models, so they can be joined by a tyranid prime.

An Avatar is always bought as a single model, so cannot be joined by an IC.

Page 48 top left bullet point of the rulebook.

As above. I think the only MC units that can be joined by ICs are Carnifexes and Spyders.

..but not for any "MC" reason, just the fact they are usually units that always consist of a single model

Gracias all!