Answer:
The most qualified
Explanation:
It all depends on the context this person is invited to attend too. Yes it brings a great feeling when someone that is knowledgeable comes to the rescue or shows up in terms of support and several words of un-quantifiable meaning will be addressed to the person in question.
It is of great joy such person arrives at such scene, the best word i would give such person in this context is "The most Qualified"
