QuoteYou can easily say that the PredAlien, along with inheriting the dreadlocks, pigmentation, mandibles, and other unique features also inherited a similar reproductive system.
This assumes that the Predators reproduce the way Chet did, which is the very conclusion you're trying to prove. That's circular reasoning.
Quoteyou could say that the crest is yet another feature from the Predator host.
Why? Predators don't have crests, but we know Queens do. As an aside, we also know from the ADI guys that they specifically designed Chet with a crest in order to imply that she was a young Queen, if the fact that she could reproduce didn't give it away.
QuoteThen we'd be discussing why there's a design flaw in the ultimate survivor's biology.
That assumes that Aliens are in any way "perfect" and that some kind of "design flaw" (assuming it was "designed") is impossible or out-of-place.
QuotePlus, that would make Queens expendable.
How so?
Quoteas there seems to be a short timeframe in the canon theatrical cut between the PredAlien's birth and adulthood
This assumes the PredAlien-Queen was fully-grown.
Like I said, citing
an Alien's reproductive method (an Alien which was heavily implied to be a Queen, no less) which implements physical abilities that the Predator doesn't have and omits physical traits that it does have as evidence of Predator reproduction is incredibly shaky. There's a whole lot of other assumptions you have to make before you could even use Chet as evidence of Predator reproduction.