Once again, this is all pure speculation...
If an alien is effectively a modified version of its original host, a predalien would be ridiculous. If an alien from a human has super-strength + speed, who knows what a predalien could do.
Either way, there are dozens of variables involved that make this way too confusing to even begin a sensible discussion. We don't know WHAT the predalien is capable of doing, all we know is what it looks like as a chestburster. For all we know, the predalien could even be capable of using the predator's weapons! In the end, it all simply boils down to what the writer and the director want.