Exactly, they follow the spirit of the oath, because they are good people, if they weren't then someone might get technical about how Dalinar didn't "capture" the Plate. But it wouldn't matter, and I think Adolin wouldn't hesitate to give anyone who did this a nice Plate assisted smack for being so asinine.
That's true, and I'm sure that theme will be reflected in the conflicts of the Stormlight Archive. I do not think that this oath will have any effect on Dalinar's potential Surgebinding or even the plot of the books at all, except for the obvious of Renarin now having Plate. If, "I will give my son Plate" was an Oath of the Knights Radiant, then we'd run into some problems. But no one cares where the Plate came from, the fact is that Renarin has it, and that's really all that matters in my opinion.