Since when did living Itachi have DSM Kabuto under his control?!
Counting power's obtained after death (Edo Tensei) are null and void because they already died.
It's the same as saying that Minato stomps because he has BM/KCM.... No, Edo Minato did.
But in the sense of Edo Tensei I suppose you'd be correct, but at this point that's like begging on hands and knees to hype someone... Then again since he was in Izanami we don't know how well he'd be able to effectively move... He could end up just being someone moving sluggish due to the Uchiha Kinjutsu.
I like how when kabuto fans use this logic everyone defends him and says every dead ninja is his power but when it's about itachi they go into denial and bash the person
Kabuto
1. Still
Alive
2. Used Summoning Contracts
3. Used Talismans to guarantee service
Itachi
1. Dead
2. Has no contract
3. At this point Kabuto is on a Dream-State: meaning his actions are notably sluggish... Even his speech was seemingly slow.
4. Has to bank on no one breaking the Genjutsu, or Kabuto's stolen DNW from disrupting the chakra network
Madara
1. Used Summoning Contract
2. Was
Alive when Controlling Kurama
You really can't claim powers obtained after death as part of an Arsenal. Additionally, the functional state of said Kabuto is already questionable at that.
So while in theory
Edo Itachi could control Kabuto (hence in theory Kabuto is a part of Edo Itachi's arsenal), at this point Kabuto is only a Dream-State fighter, and only has a plethora of scrappy summons except Kimmimaru and Chiyo. It ends up not being quite as powerful as it sounds.