I dont have the 3.5 dmg, but I do have the srd.
SRD:
Leadership:
Cohorts earn XP as follows:
The cohort does not count as a party member when determining the party’s XP.
Divide the cohort’s level by the level of the PC with whom he or she is associated (the character with the Leadership feat who attracted the cohort).
Multiply this result by the total XP awarded to the PC and add that number of experience points to the cohort’s total.
If a cohort gains enough XP to bring it to a level one lower than the associated PC’s character level, the cohort does not gain the new level—its new XP total is 1 less than the amount needed attain the next level.
I see no ambiguity, no way to rule it otherwise, it specifically says that cohorts do not draw exp out of the pool.
Plus, since the cohort is so low of level (and he is, have no doubts about that, 2 levels behind generally means you have a much lesser part in most things), along with taking part of the pc's money, and costing a feat are all enough payment without anything else.
SRD:
Leadership:
Cohorts earn XP as follows:
The cohort does not count as a party member when determining the party’s XP.
Divide the cohort’s level by the level of the PC with whom he or she is associated (the character with the Leadership feat who attracted the cohort).
Multiply this result by the total XP awarded to the PC and add that number of experience points to the cohort’s total.
If a cohort gains enough XP to bring it to a level one lower than the associated PC’s character level, the cohort does not gain the new level—its new XP total is 1 less than the amount needed attain the next level.
I see no ambiguity, no way to rule it otherwise, it specifically says that cohorts do not draw exp out of the pool.
Plus, since the cohort is so low of level (and he is, have no doubts about that, 2 levels behind generally means you have a much lesser part in most things), along with taking part of the pc's money, and costing a feat are all enough payment without anything else.