Look at this example below:
We can see a lot of things from this; in particular, we have some cadential motion going on with a raised C# to D in the key of d minor. Also, there is an F underneath the D which make up an i chord of Dm. Plus, there is an A bass root in the pervious bar which act as a V to i cadence.
But there really isn’t a root motion of V to i at all with the bass note missing. Yet, if performed, we do hear this as a cadence.
Point I’m getting at: sometimes even with the removal of “the floor beneath” you can still imply a cadence. While it is certainly not as strong as a perfect authentic cadence in full, it might be the weak cadence you are looking for.
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