I disagree, most of the guys you mentioned have brought subtle changes, look in some way different. Dexter has been identical for a decade.
yes, hence the "+/-" a few percent
every year people post ill lit, random ass photos from completely different perspectives / points in the season and start hyping up the incredible "changes" in one of these athletes.
then we get the olympia stage pics, and they're nigh indistinguishable from the previous year 90% of the time, +- 5% the other 10% of the time
the difference between guys like dexter and phil is that they are ALWAYS 100%, whereas kai, wolf, etc. might be off a little one year, on the next -- nothing major