He hiccups every time it's mentioned, and the only time he has ever convincingly denied a conspiracy theory was the Watchers, almost as if he had been conditioned.
Huh. I wonder if the Watchers are the source of Uzushio's vanishing? Whether as punishment or protection? And Kagome's emphatic rejection of their existance could be a Marked for Death version of "There is no war in Ba Sing Sei." Or maybe it's just good old fashion "nope, no need to even
think about them, my sweet summer child. They're
certainly just myths and you
definitely don't have reason to think about them, talk about them, or do
anything that might draw their attention to your soft, squishy soul... if they existed, of course. Which they
don't." It's the only bluff/lie that Kagome's ever succeeded in telling because it's the only one that mattered the most to him.
Fuck it, my new
(outlandish and very likely wrong) idea is that Uzushiogakure was fucking with some
dangerous, universe-blending-with-the-Out level of shit and Kagome, outcast that he was, was one of the few who spoke out or tried to resist. The Watchers punted Uzu into its own pocket dimension, locked it, threw away the key, and placed Kagome/others in the wild with a mental "do not do
[REDACTED]" along with a "we were never here" stamp. It's this interaction
(on top of whatever metaphysically that makes Kagome so... Kagome. Bloodline? Sealing Failure that grounded his soul into the Out?) that allows him to be the Universal Constant that he is. Jiraiya was only allowed to remember the Watchers because he needed to remember the warning. Bio-seal lady was never given a warning because her skill wasn't high enough to tamper with the Outer Veil, even by way of seal failure --and the Watchers don't really care about the mundane world, as long as it's still separate from the Out.
Or maybe Kagome's just an example of what the Watcher's retirement/disability plan looks like?