Regarding Jake who has the first apostle's power but he as a person seems unfit to use it. It fits more to a tyrant who does not see people but rather tools. If you remember early on he is a loser. He uses his powers for no beneficial reason and its not like he tried developing his powers. The one time he advanced into the second level by destroying Mia's mind he fell down and ignored the voices in his head(the first apostle). Only after becoming Ella's toy and taking over the ministers house with his powers does he realize its usefulness. So just by Jake's story he seems unfit to have this power and thus can be deemed a failure.
About the memory and physical trait we simply don't know. I personally assume it to be the case that your reason to grow the apostles abilities resides in your shared % with them. So if you are 80% 12th apostle and 20% 7th apostle your abilities to grow the 12th apostle trait which is creation would be easier as your share more with them. I believe this relates to the MC in the way that sure he maybe is more evenly split but near the end of the current story we learn how his mom, a previous memory trait user manages to still linger with her power and help MC with the memory trait.
tldr on both:
jake as a person is not compatible with authority trait, too weak mentally
powers might be easier to train the more of it you have. 80% of X apostle is easier to use than 20% of Y apostle.
None of these are what I was talking about...
About Jake, I was talking about Order, not Authority. Order, according to Aglaecwif, is the strongest power and controls the fundamental laws of reality or some such, and comes from fully inheriting both traits of the first and second apostles. Also according to her, Jake was a potential inheritor to Order, but was a failure. I was wondering how could he possibly inherit Order if he:
1. Seemingly has perfect affinity towards Authority (100%), which would leave him with no affinity for power.
2. Does not have any displays of the second apostle's trait and abilities, which should render him incapable of being able to use Order.
As for the second point, it was about why MC can't/couldn't/hasn't shown any use of the second so-called combined powers, evolution, which he should be able to access due to his high affinity with body and memory. Some of the causes that seem most likely to me are the following, in no particular order:
1. He is incapable due to not being a perfect split between Body and Memory.
2. He neglected Memory and due to that can't develop Evolution, at least until he equalizes Body and Memory's levels a bit.
3. He can/has use Evolution but we hadn't noticed because we don't know what It does, or he doesn't know how to use it and unlike Body and Memory, whose activations are very simple, Evolution might require more specific conditions.
4. There is some other way that awakens the combined powers, such as reaching level five with the capability of acquiring them.
What we do know, is that these powers probably exist and are beyond theories at this point, as Aglaecwif said any spawn who inherits the traits of any twin apostles would become incredibly powerful when talking about Order, and their names were mentioned in repeated dialogue of twin apostles in the memory training, but we don't know practically anything beyond that.
TLDR: I was talking about the combined powers of twin apostles.