Blue guy a xeno mutated sj?

Ok..I'll cut this short guys, Maybe the blue guy is a former sj, that has let a xeno change him. Yet, due to high technology, he has developed a method not to be totally transformed to a xeno, but being partially an sj and partially a xeno. The reason? He might wanted to have the brains of the sj in tact and also acquire all other good qualites from the xenos. That is strength, durability, survival abitity, fast reflexes, and maybe a sort of immortality....meaning the ability of living for many more years than a standard sj. Somehow vice-versa he also acquired some other xeno qualities, like protecting the hive or species thing with great enthusiasm, rendering his fellow-sjs expendable. The proof? The blue guy seems to have an almost human head, while the rest of his body appears to be in a uniform , or an alien exosceleton and has extremely large similarities with the exosceleton of the alien we know from the first film. So in order to keep his immortality, that guy should periodically be feeding the xenos he nurtured, by giving them the potential to host others and grow. He would continue keeping his xeno-sj fusion in control as long as he fed them tactically and by visiting planets with compatible life forms to be hosted by the xenos. Tries to do the same in Prometheus. After having depleted his "stock" of fellow-sjs...he waits for the next chance, the visit from Earth. So it is a trap. The pictograms may had been planted in good faith by the benevolent sjs, but this knowledge was used by the malevolent blue guy to trap the visitors. Now why just he didn't visit Earth alone? I can think of some reasons...maybe he didn't have fuel and waited for Prometheus' fuel. Or maybe he couldn't find his way to Earth, until a visitor would become assimilated, by a hideous pink creature, he released to exploit what was on the visitor's mind and find his way to Earth easier..or needed the visitors first, to host some of them, as the trip to Earth might be long and he could use mutating visitors to regenerate his immortality....who knows...Any questions? :)