I did a 4 linked to 1 and it takes a day or two for certain restrictions to lift (like being able to trade) but my recruiting account is old so I didn't have issues with recruiting from it. If you care more about getting leveled toons on one account my set up is sweet. You can you a step down strategy for granting levels like I did. You get your first group to 85 which give you 42 levels to grant per RAF account which equals 168 levels. Divide that by how many 85s you want and you only have to level to 85 minus that number. So, assuming you want 11 85s like I did - that's 16 levels you don't have to level on the rest of the accounts. If you keep stepping down and take into account the fact that DKs start at 57 or 58 (since you can't really grant levels until you finish the DK starting area) you can get 11 85s in no time. It's best this way because the higher the level the longer it takes to level it. I think I got all my 85s with 5 groups (85, 69, 50-something, 30-something and 30-something and then just leveling 4 or so accounts to 7).
It's a little off topic but you did ask about the 4 to 1 linking and thought I'd offer my suggestion for a setup that worked for me. I'm working on leveling all the 85s to 90 now (I recommend getting all the 85s you want first since the RAF bonuses don't work past that).