The operative word here would seem to be SEEM. Because Rosencrantz and Guildenstern don’t actually have a clue. They keep trying to manipulate Hamlet. They keep trying to get him to reveal himself – but he catches them at it every time. They don’t have the slightest idea about where Hamlet’s stops are.
Horatio might know where the stops are – but he wouldn’t use them. Claudius might also know Hamlet’s stops – because he does keep on pushing Hamlet’s buttons. But Rosencrantz and Guildenstern are much too obvious. They blunder right through almost every interaction with Hamlet.