Things Drew would probably benefit from in MGS4:
-10000% more crouch walking
-Going easy on inventory slots to reduce stress build up and psyche drain
-Utilizing Solid Eye for more than NV, specifically for spotting items/enemies
-Understanding he's on the rebel's side by default
-Understanding the threat ring (sitting still and crouching to see enemy movement)
-Codec
He's doing decently so far, but it's unfortunate to see him skip over large areas by running and burning through rations.
Actually hugging walls would also help. Something he kinda never learned.