Golf/GTI VI :: Transmission Shifter Goes Into 5th But Would Not Engage

Out of nowhere the car wont go into 5th, so I need to check the cables adjustment and if that doesn't work go from there. This car as of now is nothing more than a daily driver, never driven hard. I bought it last June with 40k on it and as of today it sits at 68k. Happened Friday worked fine on the commute to work, but on the way home once I got on the highway I noticed it would not engage 5th. Does not grind, pop, or anything. It is like the shifter goes into 5th but the cable has been shortened to not engage. This may be the issue but reverse, and 1st-4th work great with no issues.

I also read about the narrow oiling holes for the 5th gear and they are very easy to starve when temperatures get too low, which it has been roughly 0-15* here. I also read that the seal on the transmission gear shift unit (0A4301230H) can get worn out and allow back and forth play in the shift unit. Lastly the 5th gear is pretty weak and teeth like to shear off.

I had installed new shifter bushings the week I bought the car, and the fluid was flushed and replaced with Liqui Moly and their MoS2 additive about 5k miles ago. I'm hoping it is just the cables out of alignment due to the cold, but if not I will explore the options, as I have priced out all of the replacement parts and it'll be around $1k to replace the gear, 5th synchros, shift fork, and the gear shift unit. So a 02Q might not be out of the question.

I tried to manually pull up on the selector and move it right into the 5th position. Would not engage, so I am lead to believe that something is either wrong with the selector shaft of the transmission or the 5th gear itself.