Update 6/20/2020: Note that the below commentary is valid for a single mage boosting via regular tactics (like LoS on a corner and what not) but Mages using obsticles and pathing (like the fountain in SM Cath and the pedestal in Mara) and Blizzard-Kiting and mana regen from low level mobs can do boosting to cap...
I don't know if anyone has done and posted any direct comparison of the XP at various level breakpoints from Levels 40-60 of a full team vs 4 and a 60.
I think part of the issue is that the 60 mage couldn't handle the hits from larger pulls such to justify the XP reductions. If I recall correctly one of the folk doing a 60Mage+3Mages+Priest ended up trying to level just 3Mages+Priest as he felt the XP losses with the 60 Mage were no longer worth it after ~40...
A 60 Paladin or 60 Warrior can survive pulls of larger groups of mobs than a regular party could and with sufficient AoE from the full Party they can kill the huge pulls at least partially offsetting the XP reductions due to having a level 60 in the party. In the end using a 60 Tank (Paladin or Warrior) really trivializes much content with great AoE Aggro so there is something to be said for that even if it ends up being slower than a full party all at the same level.
If I followed correctly above Scapes was using a 60 Warrior to boost 3 Mages + Shaman but I don't know how high he got nor what XP/hour he was getting in the various instances past SM.
Without more data the fastest to cap may still be a full AoE team (like 4M+P) going straight to cap by avoiding bosses and just farming XP in instances.
The only thing likely to be faster would be tag boosting 1 or 2 characters to cap (via Pets tag boosting at the lower levels) and probably the best combo for that for a 5 boxer is 3 Level 60 Hunter Pets+2 alts (if you only need 1 or 2 alts boosted). There have been some phenomenal feedback on this but I am not sure if anyone has done 1-2 alts all the way to cap this way.
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