Phantom Troupe didn't show any reliable feats to make me believe they can deal with Netero's speed, let alone potency.
I'm able to pay respect to some characters if they provide on panels feats. No Troupe member is as fast as Netero or Guards, let alone they are strong to exchange blows with Netero or Guards.
In the scenario presented by Saka, Netero has prep time, what makes you believe he will not come up with a plan himself to take em down, especially since he will know what they are capable of.