Nathan proceeded with the evolution without wasting any time. He had a lot of things to do after the evolution after all.
He managed to evolve Anubis with only one god level alien because he originally had such high progress.
Orochi, on the other hand, actually failed to evolve with one alien. While it was true that Orochi was strong, that was all he had. Unlike Fenrir, with his abnormal growth rate, Orochi's other traits were quite low.
So, Nathan had to supplement the remaining power to let him evolve.
On the bright side, Nathan managed to figure out how much a god level alien gave his familiar.
Of course, the value might be different for each alien, but he could assume the average.
In the end, he set the number 140% as the average. Yes, all that 140% could be split into four categories, but with Nathan's ability, he could focus all that into a single evolutionary trait.
