Decking Advice - Composite Edition

Context: I hired contractor to build a 12x20 Timbertech deck and the last board (furthest away from the house) is in trouble. I know nothing about this sort of stuff, so any advice would be greatly appreciated!

Problem: The contractor says that there is a two inch overhang, one on each side that’s above the 20ft standard board size for timber tech. He can’t use a single 20 ft board now because it’s too short. He basically overcame the problem by using one 4 ft board and one 16 ft board.

Is there anything I can advise him to do to make it so that we use just one 20 ft board?