Even without heightened perception it is totally possible to have a blind cat learn to adapt to blindness and have more honed senses then a non disabled one! Heightened perception would just give you supernaturally strong senses, not like Dovewing level but say able to hear even a whisper all the way across camp or the breathing of a mouse in its den, which can totally be helpful for a blind character, just not
necessary.
(An example for smell would be like the ability to scent the emotions of a cat youre talking to or ability to scent things even after they were washed off with water or overpowered with a herb, which is a common tactic ppl use to get away with murders)
As for purchasing the purrks twice to have two senses I vaguely recall a staff member saying it was cool but Id double check as I cannot remember who said that or find a screenshot.
Hope that helps a bit!
@
snowflake.