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Take care, there's no selection here on CTBBestEnergyProb yet! We'll see later that this is not an issue.
In general in the overlayed set I find that more events with low energy pass the trigger and the filter. Low energy, low CalEnergyRaw and few tracks.
What happens to CTB vars due to these overlayed events? Ex: CTBCORE:
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A more direct check: what is the difference for v17r16 events when overlays do not hit either cal or tkr? Compare newx plot on the right with bottom left in plot above.
Just to be sure: same plots with "CTBBestEnergyProb>0": no big change here. 
Next, a look at the Psf CTB analysis to see what happens in detail to these events