The main issue is that you own a lot of good ninjas that work best with azure fang but you don't want to be azure fang. To be able to choose what main be is a luxury only p2w have. If you go on with this mentality, sadly, in the close future you'll be left a ton behind your enemies that pays to win in your bracket. To be able to stay on par with your enemies by being f2p is fundamental to change main depending on the ninja you got and select the one that best suits them. Currently you have both the chance to go for chojuro, ao, mei and mei, mabui, tenten gnw lineups that both are metas for water main (not for fire). The other option you have is blitz team with mb but with han and masked man introduction this team is going to fade off soon and just now you don't see many around in top placement in older servers.

Obviously you can try to go for the main you like the most but just beware that by being f2p you can't have both the main you like and being top place unless you get the luck of the devil. Will come the moment where you'll have to make a choice between power and ninjas.

Yes is pretty easy, but the point is: how much will it cost to you?

Lets say you want a viable fire main team. You need danzo and sage naruto or hashirama and sn or han and hanzo. You don't own currently any of them, so to get them you need or to invest tons of scrolls in 'old' treasures and/or a ton of coupons and what you get is something that gives you the same outcome as the azure fang team you can just now run for free because that's what you got. What happens on long term is that people that accepted to change mains based on what the luck granted them get 300/400 if not more seal scrolls ahead of you in future treasures or 10/15k coupons ahead in power that you spent for ninjas. That's what I'm saying.

Anyways, if you plan on the very long term you should gather about 1000 scrolls for gnw treasure and make a team based on which one between naruto linked kurama and madara you got. Otherwise you could just go for the jinchurikis and get both roshi and han. Neither of them is going to fade off any soon.

Gratz.

Yep and i see more mistakes on the water main team side and still he won by luck (look at how low sage naruto hp is, one more stack of roshi or a crit from han/roshi mysteries and he would have lost).

btw, for the OP, i use in arena your enemy team too and i can tell you the only fire team against whom i lose have itachi susano'o in it. I can see the major mistakes your enemy made were to not use wisely han mystery. After round1 he was sure you had shield mystery so in the following rounds he had to use han first part of the mystery after you used main mystery, maybe together with roshi's, at the cost of waiting one more round to move. Very likely he used the mysteries as soon as possible, also healing ones, while that team wins by waiting the right moment to move since you are compelled in using your main mystery on the round the mystery is available, otherwise you have to endure 3 stacks of sailor sakura poison + roshi eventual ignition. If he uses han cleaning and roshi mystery after cleaning removed the shield immunity you had no way to win. Remember also that that team doesn't actually need to use the healing mysteries as soon as possible and wise people prefer to endure one round of hits if needed without using healing mysteries.

Imho is not worth at all to go for ay/sasuke susano'o at this point. Btw, the team you faced made a pretty poor use of ay.