Nozzle test pattern analysis (pics included)

[Boooooo]

Hi guys
kindly looking for expert feedback about this nozzle test patterns I was given to demonstrate printhead is broken*.

One stripe should show a working good printhead the other (with big "holes") the faulty one. They assure never worked good but I suspect test are from SAME printhead was working then stopped soon since they are using cheap and not original inks....

Also curious to understand if that holes in the pattern can be easily created (cheating, to make appear a false test pattern)

First test pattern pics

Second test patter pic

Of course here both stripes are from faulty printhead

*I have helped a "friend" to buy this expensive printhead and now I was asked to go back to the seller asking a refund, but since the buyer

1. not accepting a replace "the seller would send again this kind of not working, supposed refurbished, print head"
2. resisted (making creative excuses) to take off the printhead from the printer (yes wanted me ask seller refund without ship back to china....)

Have started to suspect....

Printhead is DX6 model, suitable for Epson Stylus Pro 7700 9700 7890 9890 7900 7910 9900

Regards