We believe only Allaah is Haazir-o-Naazir (Present & Witnessing), the Martyrs being “alive” does not make them Haazir-o-Naazir or possessing of supernatural powers to help us.
When we send Durood (blessings/salutations) upon the Prophet 
it is by asking Allah.
When we send Salaam upon the Prophet , we believe that there are angels roaming the earth who will act as messengers and deliver our Salaam to the Prophet .