Understanding which-way patterns in DCQE

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Figure 3 of the below shows 1 blob.

http://www.fsc.ufsc.br/~lucio/2003-07WalbornF.pdf


Other illustrations show 2 blobs...i.e. one for each slit.


When does 1 blob happen and when does two blobs happen?
 
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Figure 3 is just a thought experiment. Supposedly the photons no longer act like waves if they emit photons that are detected in the cavity and make a blob on the detector.

Where do you see 2 blobs at?
 

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