In his main team he has 2 accounts and his second team 5 accounts !
That's not possible.
One team is one account, facebook or google account.
It is legit to have as many accounts you want.
What it's not legit is to affect with one team/account the results of your other team/account.
For example to support your team with other 5 accounts or to have 2 teams in the same league and when playing with your main team, to use an illegal formation only for that game.
If someone report this, you can be banned.