I am not sure the groom brother is much of a loss to speak to, he does not come across as one to sympathize with.
Even before the follow up links saying he could not get away, that was what i was thinking. These shows often keep people locked down pretty tight, does not surprise me at all that it was not that flexible.
The brother seems sour, and likely needs some space to simmer down. Sadly I am not sure i blame the twin for not feeding the drama llama. Really if he had said something on TV than the brother could say he was stealing his thunder, if he had called/texted him he still could have been blamed if people were interested.
I for one would be very hurt and somewhat offended if someone i cared for gave up an excellent opportunity for my wedding. Hopefully ill be in their life for the rest of ours, but you only get so many chances like this. Id want them to take it.