The best method is to link them in a circle A -> B -> C -> .... -> A This allows every boost after the first to only have to cover the first half of the levels.
Group 1 levels to 90, gains 44 grants
Group 2 levels to 46+, is granted remaining levels, gains 44 grants
Group 3 levels to 46+, is granted remaining levels, gains 44 grants
....
Group n (of DK) leaves their starting area and is granted remaining levels.
Any non-circular linking leads to more leveling needed as everyone has to go to 90. Also not every account has the same number of characters. linear is 1 -> 1.5 -> 1.75 -> 1.875 -> 0.9375. There are other linking methods that are slightly more balanced, like the U and Y methods (totally made up names). Links point the way levels are granted. The green box is +1 over the listed number if you level teams of 5, the picture lists the amount earned if a booster is used on the white accounts.
The U method produces 6.5 characters per boost and the Y method 7 characters per boost across the accounts. Linear is 7.0625 and only has more characters total than the Y method if 16 levelings are done (all of these are +1 per time if groups of 5)
The downside to linking in a circle is that if you have older/existing accounts on your battlenet that you want populated with more characters, they can't be involved. However, you can use character boosts from your RAF accounts Legion on that account, blue post here. This likely may be true with HfA also which combined would give you quite a number of characters on the additional account. Between the two expansions, you can nearly flesh out an additional account at 100/110 depending
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