Dehumidification System - Dual Path

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I read an older post on this topic with no answer,

I am trying to model the following system in OS,

There is the fresh air plus some of the return air that goes through the DX coil to dehumidify, mixes with the rest of the return air and all goes to the space,

I have the following system in the OS,

so my question: Is it enough to only have a duct in the second path? how to define the right set points for the model? Humidity and temperature. and also all the flow should pass the fan, so the fan power should be more, whereas in my current model, the bypass return doesn't go through the fan.