Amakhosi have largely been underperforming over the last three seasons, suffering their longest ever trophy drought since the club's inception.
The arrival of Billiat has since brought about positive responses from the Chiefs faithful, who felt the club's transfer business was left wanting in previous years.
Mooki and Nzama have further backed the arrival of the diminutive forward, as well as that of the other signings.
“He will do well and he fits in perfectly with the Kaizer Chiefs style of play,” declared Mooki on the club's website.
“Billiat will add value and experience. He will combine well with Leonardo Castro, as they did at Mamelodi Sundowns," added Nzama.
"I have seen Letlhogonolo Mirwa in action – the left-back is another good signing, while Virgil Vries complements the goalkeeping department nicely.
"I feel positive about the upcoming season.”
Meanwhile, Mooki also believes the arrival of a new coach could bring about a resurgence in the rest of the squad, regardless of who it might be.
“A new coach will always motivate the squad because the players want to impress the new coach,” he concluded.