User blog comment:B214/General Discussion/@comment-29963364-20161028202621/@comment-29963364-20161029001415

In real-life Mythology, the Trimurti (the Hindu Trinity Deities: Shiva, Vishnu and Brahma) have something called the "Third Eye". Using this "eye", they can look into, comprehend, and understand the nature of all things. And using this information, they can accurately predict future events down to minute detail.

So rather than "Future Vision", it's more like "Very Accurate Guessing", or "Super-Educated Guessing."

So yes, this leaves very little room for blind-spots. However, in the DxD series, there are characters who out-right defy reason or common sense (Issei coming back to life with Great Red and Ophis' help as an example), so it's possible for the DxD version of Shiva to have a blind-spot. At least in theory.