Im gonna spoonfed it to you guys.. ill summarized it..

Ego made bluelock to produce a striker with greatest ego, he never wanted to build a bluelock team. On the selection Before playing U-20 bluelock vs japan, originally wanted to narrow down the bluelock peepz to 5 striker but he was forced to changed it as buratsuta was in the way.. now ego changed plans to fight agains japan rep, which has sae. ego assemble the bluelock 11 so he said he will assemble a team that 5 players will be assigned to their roles to revolved round top 6 potential striker players.  So again ego never intended to build a bluelock team.. but just a striker with greatest ego... so the reason why isagi got mad at karasu was because karasu was in egos top 6 back then and now abandoning it and following hugos way. Which is why ego said he has no desire with that kind of goal when karasu and hiori score.  Karasu was literally on top 3 spot out of six on selection time.

Now interms od philosphy between ego and hugo.. jinpachi literally let everyone know that  bluelock is an experiment, this is ego's theory he found based on experience, probably inspired of wanting to see that god again hes been wanting to meet again. Thats why he come up with that theory and developed bluelock. To teach these bluelockers that this is also another way to become the best. Which is different to hugos philosphy he founid on his own experienced. So egos theory of course it has flaws.. its an experiment at all that has been working from the start to nigeria until france. So now egos way about to be tested..

Can't stand the BL fans who doesnt understand the story