FYI: Do you randomly get an AWEFUL squeak in the morning?

[Epsilon]

My interpretation from what the OP described sounds like when the pulleys and/or the alternator bearings are going and it squeaks on cold starts only and then goes away.

[sapote]

The main bearing on cylinder 5 is a thrust bearing, but I guess that's not what OP meant.

You're absolutely right.
How deep were the PP fingers cut by seized up TOB?

[sapote]

My interpretation from what the OP described sounds like when the pulleys and/or the alternator bearings are going and it squeaks on cold starts only and then goes away.

and that pulley will break off one day soon if not replaced. For alternator, the bearing outer race will spin and machine off the alternator housing.

[Arith2]

This video portrays the sound perfectly. Skip to 1:20 through this retard revving on a cold start.