wood is considered "dry" at 20 percent or less moisture and "dry" wood that weighs 1 pound has about 8600 BTU in it. Now to boil off this 20% would take about 2000 BTU so now "dry' wood has about 6600 usable BTU in a pound
Now remember, a pound is a pound no matter what type of wood it is so the weights i sent last time reflect that the denser teh wood is the less cords you would need to equal your pals ton.
YES your pals ton of pellets would be about 1/2 cord of "dry" oak and that 1/2 cord would increase as teh density of the wood decreased.
remember the less denser the wood, the lighter it is so it would take more wood BY VOLUME not WEIGHT to match the amount of BTU in your pals pellets. Hope that clears it up a little for you