Yep, that is the impression it gives me, and sometimes I wonder if that is one of the reasons why even today
Lupin the Third is regarded as such a popular and iconic character in Italy.
Even if I prefer
Mr. Ōsumi's episodes (as I said at other times, like here
http://www.neogaf.com/forum/showpost.php?p=33672787&postcount=3255 or here
http://www.neogaf.com/forum/showpost.php?p=36575428&postcount=5308), I respect the task that
Mr. Miyazaki &
Mr. Takahata made possible taking over the reigns of the production after all. I've thought that the difficult position in which they affronted such a work didn't leave them time to develop their ideas further and adapt them into each episode's time, and I always excused them because of that even if I think it was a very good work all things considered.
I think that the episode you mention would have benefited of a longer running time proper of a film like
Lupin the Third: Castle of Cagliostro to expand on what it tried to achieve, because it is true certain episodes they made lacked the kind of refinement that afterwards
Farewell, Beloved Lupin (for example) had, taking into account the little constraints
Mr. Miyazaki suffered to work on making this self-homage from his position at
Telecom Animation Film Co.,Ltd., as this studio collaborated with the occasional but finest contributions to the 2nd series.