I take your point but I have to disagree, Fletcher is not exactly prolific with Scotland and hasn't played with Scotland for a while. I think you're being harsh n McBurnie, he's had 6 caps so far. He's scored three goals since the last international break and has 7 in 18 appearances for swansea. Fletcher has 3 goals this season, not much difference in terms of total goals but McBurnie is on better recent form.
Paterson is playing at a better level than Fletcher and has scored 3 in 4 for Cardiff playing as a forward.
Basing this on form I don't see Fletcher being the first or even second choice. I would counter your experience argument with Paterson currently playing in a better league.