No, since we added a head coach to the draft (and later bench spots) we're only drafting one person to do both. It does not mean that that particular person HAS to do both. It can't hurt you if he does do both, but he doesn't have to. But if anything, it'll only be a small "deduction" if he only does one.
And even then, keep in mind that there is a difference between a player that does not CURRENTLY do both, and a player that has never done both. For example, a player that at one point did punt returns and is now only doing kick returns is different from a player that's only done kick returns and never attempted a punt return. In the scheme of things, it isn't really important, and I can guarantee to you that that minor detail will not be a deciding factor in any matchup.