So what's really going on here?

Enzymatic ``binding rule'' is ``exact substring match'' (Aaahhhh ...)
So a ``super-string'' will immediately parasitise any host sub-string which was previously dominant (think ``hyperline'' rather than ``hypercycle''!); and will quickly displace it completely.
All the ``selectional'' events in this particular model are of this nature: the huge ``parasitic'' gain easily outweighs each slight, incremental, decrement in fidelity (reducing intrinsic fitness).
Playing games, not climbing mountains (improbable or otherwise!).

Barry.McMullin@dcu.ie