Marcelo,
well, i am not sure about this...
My point was about establishing new communication after an outage with
external hosts that don't implement the shim.
This is important becuase at least in the early days, most of nodes
won't implement shim.
Explicitly taking this point into consideration would allow to provide
some degree of fault tolerance (i.e. the capability of establishing new
communications after an outage) even in communications with nodes that
don't implement the shim.
This is a general transition issue; I guess the protocol should specify how
an shim6 endpoint works with a non-shim6 endpoint.