Compared to the tactic of threatening other mage forces through the necks of the Card Battle Mage profession employment and transfer, this shared knowledge and mutual exchange with a soft knife is more deadly.
Just as ordinary mage professions and sub-professions need War Mages as magnifying glasses to amplify their own advantages, War Mages also need the mage theories and spells of other schools now and all schools in the future as capital, continuously pushing the characteristics of the War Mage itself to higher levels.
The relationship between the two sides is evidently one of mutual support rather than opposition or conflict.
From Kael's current situation, as long as he preemptively occupies the market, it would be nearly impossible for others to find a breakthrough for the War Mage from him.