I disagree. Don't call an idea terrible just because it doesn't work. Having two paladins would be quite benefical actually. i find myself in need of more then one paladin quite a lot
I believe he has a good idea. To be able to make a priest is interesting in the church/chapel. Now, going with only one per account / one per village or make it like other troops would be the question.
If you go on per account it will be just as powerful as the paladin. Except, unlike the paladin it will have more defensive abilitys. Having weapons that buff certain troops. Maybe even buff your own army. You could even have a weapon that helps the priest heal troops in combat so they are able to fight longer. There are limitless oppertunitys. Just because the original idea isn't good doesn't mean you can't improve the idea