I believe that the modern usage of Plenty requires the outsides to 1/4 Right before doing the Counter Rotate 1/4.

Commments:

1. the caller must say "Outsides go as you are", or "Forward Plenty" if the outsides are to omit the 1/4 Right.
2. the caller may give a direction (In, Out, Right, Left, Forward) to the Outsides, in which case the outsides 1/4 toward the given direction instead of toward the Right.
3. Scoot & Plenty -- from a L-H 1/4 Tag the outsides go Left (i.e., toward the handhold). Hence, from a L-H 1/4 Tag, "Scoot & Plenty" (one call) is different than "Scoot Back & Plenty" (two calls).
4. I believe that Plenty has 3 parts:
   1. Centers Step & Fold as Outsides 1/4 Right & Counter Rotate 1/4.
   2. Split Circulate Twice.
   3. Centers 1/2 Zoom as Outsides Counter Rotate 1/4 & Roll.

Ceder Chest Definition of Plenty