Okay... I have to explain a bit further.
The hair growth cycle I am referring to lasts several months, I believe. Maybe even a few years. After this growth cycle, the hair falls out, soon to be replaced by another.
When the follicle grows a new hair, and this new shaft pokes through the skin, this hair is at its thinnest. Then, assuming that you NEVER cut your hair, the hair would continue to grow for several months, and even years, and get continually and GRADUALLY thicker. Assuming this hair doesn't break off, it is very long, and soon the follicle ejects it when it reaches the end of its growth cycle. Let's assume you take this hair and lay it on a sheet of paper. Because the hair has NEVER been cut, from the time it began growing to the time the body ejected it, it is probably very very long. If you look at it, the hair will be thinnest at the end, and thickest at the bulb.
The hairs you see with bulbs in your shower drain are not long enough to see the trend, because we cut our hair in regular intervals.
When I said to examine hair/bulb thickness, I was NOT meaning that you could tell anything by looking at one hair and seeing if it is getting thicker or thinner. What I was saying is that if you examine several hairs, over time, you should see a trend towards thickening shafts and bulbs.
For instance, if you choose a very particular spot on your scalp and do a hair pull every month, if your treatments are working, you should see thicker shafts and bulbs, over time.
I hope you are understanding what I am saying, it is hard to put into words.
Anyways, the reason why I even brought up the subject of hair bulbs is because someone here was complaining of seeing 'thin hairs with no bulbs' and I was just offering the possible explanation that these hairs might not be thin because of male pattern baldness, but, they might be thin because they are young hairshafts.. which might be a good thing? these new young hairshafts might be indicative of improvement if this person only waits to see. And the only way this person can actually KNOW how thick or thin these hairs will be at maturity is to wait until the body ejects them, and the bulbs are visible.