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I think people still have this misconception that the vassals and duke are some sort of NPCs that we often see in the games we have here in our world but they aren't.
MC isn't the only one to give credit on why his kingdom is so powerful. In truth, the Grand Dukes of each kingdom are very intelligent and are capable rulers themselves. MC's playstyle before being isekaid is similar to a puppet king when you compare it to actual historical stuff. He was the face of the kingdom, brought morale, and handled the recruitment of skilled vassals to make his kingdom stronger.
BIG HOWEVER, MC never handled the political, war related and all that complicated kingdom shit. His Grand Duke was in charge of that and that was what MC and the Grand Duke was cool with.
PLEASE PLEASE PLEASE remember that their race, got a godly boost of stats because of the potion. MC never got that boost before the isekai but after he took the potion after the isekai, there's no change really. It basically allowed him to eat the same food as his people(reason why he kept puking) and since MC's a PURE support type charcater, the only boost he probably got is his mana/MP stat. Again, the King and his vassals/duke may be the same race but each and every single one of them has different specialties, expertise and stats based on those 2!!! So while his vassals and Duke are fucking OP, MC won't be the same!!!
ALSO NEWS FLASH, MC HAS TRAUMA FROM THE SEVERE BULLYING FROM HIS COUSIN SO OF COURSE HE WOULD FREEZE UP AS SOON AS HE SEES HIM. THOUGH WE DO SEE HIM ACTUALLY TALK BACK. pleasseee remember this, all thpae flash back of MC's previous life is to cement how he's like.