Shouldn´t his attack in this chapter beeing stronger since he use all three swords?
Let me explain to u to understand portrayal here :
Onigiri > Tatsumaki .
Tatsumaki used in FMI to clean fodders while he used onigiri to defeat roided hyozou who blocked in his base form Gear 2 from Luffy and poisoned him .
and Onigiri itself is weaker than Shi shishi sonson a one sword style and do the math for hiryu kaen that used to defeat Ryuma