These 'so called' interviews read as if the words are spoken by different people. The last one sure did not sound like the previous ones. The last one has much stuttering kinda like a prominent Clintonmite that was initially on the 'inside'.
I agree with you - there is too much variety, IMHO, to be the same person but I come down to the assumption that the purpose of this leaked material and possible sources are Clintonites.