Should I rank up 5 star iron fist unduped to rank 2/35

Darkness82

Shall I take iron fist up to rank 2 as a 5 star unduped

Speeds80

Personally he's not that good, I have him, but as a rule I rank all my 5*s to r2 so you can use them earlier in the infinity streak(from fight 15 instead of 20) this means I use 4*s first 5 fights then if I use 5*s after that I can do the t4b arena in 21 fights total (I have 17 5* champs)