i have read a number of those scholars and i disagree with your categorization though like you i may not be able to vouch for all of them as far ar reza he is definitely in the bridging the devite category as you will quickly see when you read his book i you look at his sources which are listed at the end of his book you will since a staggering list of islamic as well as non islamic sources and what he writes is exactly that what i might describe as a synthesis of several views structured into a unified vista furthermore i do not what you mean as traditional islamic training since this is a subjective standard