Why didn t Spock mention Michael?

It's intriguing to ponder why Spock, the logical and analytical Vulcan, failed to mention Michael in that particular conversation. Was there a strategic reason behind his silence? Did he perceive Michael's absence as insignificant or did he simply overlook the mention due to a momentary lapse in his normally impeccable attention to detail? Or, could it be that mentioning Michael would have compromised a delicate balance or exposed a sensitive aspect of the situation? The question lingers, begging for an explanation that aligns with Spock's character and the context of the discussion.