Since Zoro uses KoH, then Sanji using Ifrit is more reasonable
Trying to downplay Sanji if he is using Ifrit is meaningless, even if Sanji's base powerlevel is increased 2 times, Imu will still block him. So in this chapter, whether he uses DJ or IJ doesn't really matter.
Besides, a true hater can still say "Sanji used DJ, he doesn't play serious here and it will detrimental to his nakama"