2015 RT SM6 Burning Oil - what are the possible causes?

[wcntech]

I have a 2015 Spyder RTS SM6 with 18,300 miles that is burning oil. Pulled all the plastic and frunk and then pulled the airbox. Checked spark plugs and middle cylinder plug is darker than the outer two cylinders. Checked compression, the two outer are around 175, middle is around 140. Sounds like rings in the middle cylinder, yes?

Anyway, looking for advice from here. Everything else on the RT is is great condition.

Thanks for any help!
AJ