To be clear up front here: I'm not the expert on these data integration technologies.
So, if you find your statements confirmed by checking the documentation, that's as much as I can do here 
Just concerning point 4:
In my view, you can avoid using additional integration servers (SLT, BODS, ...) as long as the scenario really is the rather simple "get data from external sources into my single HANA instance".
The stand-alone versions of the tools are all capable to support way more complex scenarios and will have their rectification for requiring their own servers in those.
But with all the available data integration options for SAP HANA (with SPS10 there's even another one - RDSync - available What’s New in SPS10? SAP HANA remote data sync ) a huge number of servers can be be retired or put to better use as those options are now integrated with SAP HANA.
- Lars