In "MISSION: HUNT", Kim told to Iman about her ex-best friend who already looks like her own big sister during her days in Branch East by said that she is a senior agent and the one who guide her and create her a Keytar as main gadget. Kim admit has no idea about her best friend wherebaout after she got called on duty. See from her description about the identity of her best friend, could be she describe Jenny all along. Her description is very close to Jenny's personality in Season 1. Not to mention that both "Woo" and "Song" are Korean or Chinese surnames. So there is possibility that the person that Kim's mean is Jenny a.k.a Cinco.
Confirmed in "MISSION: TRAP".
Kim and Jenny/Cinco are biological sisters
If Rizwan could refuse Uno's order and believe that his ex-master who is also his father-figure is already Beyond Redemption, why can't Kim do the same thing as Rizwan by refusing Cinco's order to be the Numeros' secret intel in Arena? It could be that her bond with Cinco is tighter compared to the bond between Rizwan-Uno/Djin. Instead of Cinco being a mere mentor who already sees Kim as a "sister-figure", maybe Kim and Cinco are actually biological sisters or half-sisters all along. There are many examples of characters who share similar backgrounds with Kim, such as working with their evil family for the sake of "family love and approval" and having a hard time breaking this toxic bond. It would make sense if it was revealed that Kim and Cinco are indeed biological sisters.
I.R.I.S will not return to Ali.
Despite the buildup of Satria and the return of IRIS, Ali's Character Development might cause him to decline using it again. Satria's body type is definitely not a child's, which leaves 3 characters who may inherit it: Sam, Kim, or Rizwan. IRIS may finally give Sam the confidence he needs to be a good agent just like Ali in the past, Kim may get access to it due to her high skill level, and Rizwan may get it to combat the Numeros for his redemption.
None of the guesses are correct, but Alicia acquires I.R.I.S
Dr. Ghazali is Cero
Ejen Ali has teased and subverted the expectations of the identity of moles (Jenny instead of Rizwan, Kim instead of Sam). If someone suspects someone to be the identity of the mysterious enemy, chances are it's not them. Since Rizwan suspects Dato Hisham to be Cero, it's likely not him. Dr. Ghazali may be Cero as his specialty is computers, and the Numeros often use hacking programs. It also adds for shock value.
Hisham is confirmed to not be Cero. However, the ending of Season 3 has Othman return right after Rizwan talks to Cero via Trez, looking very ominous and suspicious. Othman may be yet another Red Herring.
The Numeros are former MATA
Cero was around since at least the formation of the MATA pillar chiefs. They might have realized how evil Othman truly is and made a Face–Heel Turn themselves, similar to Uno. Around that time, Cero recruited other agents with a vendeta against MATA. Evidence towards this point at Dos, Trez and Quatro. The first 4 Numeros focused on getting revenge against Zain and the others for supposedly planning Djinn's murder. While evil, they have some form of moral compass. Djinn gave Rudy a better life, Dos draws the line at Cinco's abuse, Trez shows mercy to Dos when she's defeated but not dead, and Akram made a Heel–Face Turn on his own. This may point to them being former righteous heroes who shifted to Well-Intentioned Extremist. The next evidence is their fighting styles: Everyone follows the MATA pillar system. Tekno (Gadget specialists): Quatro, Cinco, Nueve; Inviso (Stealth and speed): Uno, Dos, Sies and Siete; Kombat (Frontline fighters): Trez and Ocho. The only one missing is Neuro, who could be Cero as they are the ones making all the plans. The ninja droids MATA have created also had suspiciously similar wrist blades like Dos, and the Buster Droid's arms resemble Trez's. MATA might not make weapons based on their enemies, but rather they were stolen.
