I don't do it. The more players that get added, the more confusing the trade.
Ask yourself "What holes am I filling with this trade", and don't just trade for trading's sake. I don't think he's offering anything compelling that you have to accept.
If he wants Miggy, let him target Miggy, but don't confuse the deal as a 4 for 5 or some such.
Looking for advice on turning my 3B/OF/RP depth into SP help:viewtopic.php?t=430444