You can get 5pcs Gaara fragments from Black Market Merchant from time to time and if you're patient enough you could actually recruit the ninja without spending coupons or ingots. I think thats why he classify Gaara as F2P.
But the arguement is it is so obviously not worth the coupons at the price it asks for - so it is not realistic for a F2P player to do, even if they wanted to it would take 6-7 months.
So why market this as a F2P team when no F2P player would do that?
Ofc obvioiusly its not worth it, but im just stating the posibility of why he clasify it as a F2P.