stacking templates and ability bonuses

[pocketcthulhu]

So the party fought an advanced troll who was quickly reanimated by the wizard as a bloody skeleton and thats when myself and the gm had differing opinions on its stat blocks. The advanced template adds stats to the base form and the point of interest is cha (for bonus hp for undead)
The gm's stance is that the advanced template adds +4 cha to the trolls base score of 6 which is equal to its skeleton version at a 10 cha but he doesn't apply the rule for the other stats str dex and so on.

It just confuses me that he's ok with it having a silly str and dex score but it's the end of the world if it gets bonus hp.

So my official question is there any breakdown of how multiple templates stack in an instance like this?

[Starglim]

Apply the effects of the Advanced template, then use the result as the base creature for the Bloody Skeleton template. Advanced increases the troll's CHA to 10. Bloody skeleton changes its CHA to 14. Its CHA is now 14.