Dream Card Question

[Jstark]

When playing Dream Card, and you get dealt 2345 and catch the Dream Card, I noticed that the DC is always an ace. Shouldn't it be a 6? The DC is supposed to give you the "best possible" card, and the ace here is second best. Now I know for the sake of argument that both a 6 high and 5 high straight pay the same, but was curious as to why this happens.

[Tedlark]

I think the ace is the best card because you can catch another ace for a paying hand if you don't fill in the straight.

[onemoretry]

The ace completes the straight. There is no need to draw.