I’m pretty sure the runDisney bus pickup/drop-off location is only in one location - across from the ‘Springs’ (not Disney Springs) bus stop. Unfortunately, that is the last stop for the park buses internal loop. ‘Congress Park’ is the closest bus stop to the walkway to Disney Springs.
There is a walkway near the Springs to the West Side of DS, but it had been closed, and I’m not sure if it is open yet.
You can also take the water taxi over to DS. I have heard that right now it is only dropping off at the walkway bridge from Congress Park near the Marketplace (??), but it could save you a little walking.