I don't think Meachum knows the playbook well enough to step it up that much. He was lining up wrong against Washington and Brees had to set him straight... and he wasn't in on that many plays in that game.
I'm ok with Henderson and Moore carrying the bulk of the WR load this week and Meachum can just chip in like he did against Denver.
Miller is a good TE, he played very well at the end of last year.