They werent "revived", they were copied. the rematches in Eastern MH HQ are New Generation Reploids copying them. Though your idea still stands. since he defeated them, he was able to snag DNA samples. I mean, they apparently did something with em, considering latecomer Axl still gets DNA for Jango, Silverhorn, and Psyche and such. (and this is considering the fact that X doesnt obtain Special weapons this game)
another purpose is really just that in that way, he could gain X's trust and join his group to keep tabs on him. he was spying on them in first person. Would be mighty odd of the Maverick Hunter Colonel to suddenly appear in Giga City to join X and crew. This way he can play off some small backstory and pretend to be a new addition to the group.
Keep in mind Command Mission came out before X8. X8 was still in production when it came out, as evidenced by the unlockable X8 demo. So they probably didnt have all of the X8 story fully mapped out yet. so CM is the first usage of New Generation Reploids.
I see. But there are several parts that supported X's conjecture of Wild Jango being Wild Jango instead of another Shang Tsung-like reploid.
1. The way that of the rest of X's Hunter comrades addressed their respective bosses at Far East HQ during chapter 10:Massimo to Silver Horn:
"You Rat, Silver Horn!! Even you're here?!"
"I'm not weak like before! Now I ... am Steel Massimo!! Prepare yourself, Silver Horn!!"Marino and Cinnamon to Mad Nautilus:
"Well, well! Who'd think that we'd meet you again?"
"Dr. Psyche! We're sending you back to where you belong!"
"And I'm not just a helpless little girl anymore!"Axl to Mach Jentra:
"Him again? He really doesn't give up, does he?"
"You sure you don't need the help of your Mechanoloid hordes? Here goes nothing!"Zero to Incentas:
"You! Hmph! Very well..."
"You owe us more than you could know! And payment is due, right here and now! Face your fate!"
These quotes from the show that the Hunters acknowledge that the bosses from chapter 10 are indeed the real things and no one else becoming them, especially Axl's pre-battle quotes to Jentra. X already acknowledged Wild Jango's appearance as the real thing earlier in chapter 10 after Jango was destroyed again.
2. Mach Jentra was able to summon Preons in chapter 10, despite the fact that Epsilon and the Rebellion were destroyed in chapter 9. The Preons were Preon Shielder, Preon Soldier, and Preon Tank, just like in chapter 5. Who else can summon Preons easily like Jentra and Duboar?
3. When the bosses are destroyed, they do not change form like the copied bosses at Gateway did in Mega Man X8. The bosses die as they way they are shown.