ice diving harness question

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I use a basic 2 inch web harness (without plastic buckle) and 2 inch crotch strap to a backplate. So 'the board' is suggesting I need another web harness under my BC harness?

I clip the line to the d-ring on the crotch strap so I can pivot around it and manage any slack with ether hand and to prevent the side pull like MNDiver said. The strap terminates at the plate and the buckle is doubled back (climbing style) and the other end is a sewn loop and threaded through the wast belt.  That being, the D ring is captive even if the stainless waste belt was to open.

Second Q, Why no buddy? They can be a very helpfull in the entrapment we keep listing as the main hazard. I like buddies under water but they talk too much on the surface. :-)