you left out the input module, which is set to play whatever is coming from external
you can also just choose the external input as the sampling source, I just tell people to use the input module just so you can monitor and control the external audio from within Maschine, also just in case some people do not have real time monitoring on their interface for external inputs.
So yes, since it sounds like you are able to hear your motif in realtime without the input module just set the sampling input to external.
Maschine is not a linear daw, this is where I think you are confused. Tracking an mpc into a linear daw is not the same as sampling your motif into Maschine.
With this method you basically just make your patterns and instead of keeping it midi you turn that into audio, then build your track as normal inside of Maschine.