Egypt is wealthy and have the best technology research of probably any country in the game but its Manpower seems quite limited, about only half of what the Seleucid have while probably also lacking unit variety such as horse Archers which the Seleucid should have.Possibly. I don't know too much about the time period it just seemed like Egypt was large and fertile in the stream. I could be wrong about which diadochi had a more powerful base. That's kind of cool the little friendship aspect. Seems like they are mixing some eu 4 gameplay with ck 2 gameplay.
Phrygia seems rather weak, it seems quite poor compared to the other diadochi don't seems to have anything really going for them so they may be quite easy to defeat. They are also in the middle of all other diadochi so making an Alliance against them should not be that hard.
It is possible that the diadochi is going to be balanced to be more even.