You got any analytics?
You can confirm decarb with very little tooling using bromocresol green.
A potency test from a 3rd party lab would be ideal.
You can learn a lot with TLC but it would take a fair about of expertise to get the quantitative data we’d need to really address what your buddy handed you.
You say you winterized. What temp? How long? What ratio of extract to ethanol?
Fats and waxes are NOT dark, they may well be goopy…