You call the word "authorial" unproductive in this context, but
without giving any reason. If "authorial" means what the author had in
mind, then it **is** productive in the sense that this is the only
target which could in principle produce a single answer. You're welcome
to ignore this target if it makes you happy, but in that case your
structure will be intrinsically subjective.
You say << Mark is fond of the technique of "framing" >>
This suggests to me that you may, after all, be trying to find what
structure the author had in mind. The following comments are made on
Yes, Mark did use frames, but a gospel contains many internal
interconnections in language and concepts and only a few were intended
to mark structural boundaries.
The idea that the call of disciples is a frame for 1:14 to 10:52
is highly artificial. It is true that Bartimaeus ends up following
Jesus. But this is presented as the result, not the purpose, of Jesus'
power and compassion. Also Jesus says hUPAGE (10:52) which means "Go",
so Mark didn't see it as a call to follow Jesus. Furthermore it is
refuted by a clear structural frame, namely "gospel" in 1:1 and 1:15,
which marks out the opening section to Mark's **gospel**, 1:1-15.
Weston-on-Trent, Derby, UK