About Rushall, remove the station, its not like the stations are not in walking distance. The curve and bend is a hazard so its best to reroute the railway underground as proposed by Doncaster rail study team.
The South Morang line separation shown in the PTV Doncaster Rail Study You Tube clip seems silly to me and I agree that it should go underground from just after Merri station and skip Rushall and Clifton Hill altogether.
Another interesting thing is that Victoria Park Station seems to be missing from the video, I hope they are not trying to tell us something!
Now here's one out of left field for you.
I catch a couple of Metro services per week to and from Vic Park. The stations along the corridor from Vic Park to Jolimont are EXTREMELY busy and many passengers have to wait while full trains stop and go in the peak. Demand at these stations is set to grow at a rapid rate due to a huge amount of apartment construction going on in the inner city, particularly in Collingwood and Abbotsford.
So why not run South Morang and Hurstbridge lines into Metro 2 tunnel with a new underground station near Rushall.
Then re-instate the old Inner Circle line from Rushall to connect with the Upfield line and run into the city via North Melbourne and Jolimont. South Morang and Hurstbridge line Pax for Clifton Hill > Jolimont could then change at Rushall and would also be able to head in the other direction towards North Melbourne.
Doncaster Rail could then use the corridor from Vic Park to Flinders Street, sharing with the Inner Circle services which would also service pax from Fitzroy and Carlton North via rebuilt stations there.
I can hear the NIMBYs shifting in their chairs already!