Definition of thesis from the Collins English Dictionary The noun phrase A noun phrase is a word or group of words that can function as the subject, the object, or the complement in a sentence.
Sona, Ziggs, and Heimer are all still there on the top (well above 60% win rate) along with most of the champions that were there prior to the mark/dash .. Bard, Evelyn, and Elise are all still on the bottom (below 40% win rate) along with most of the champions that were there prior the mark/dash.
A low win rate may mean a champion is being played incorrectly and is stronger than his win rate indicates, but a top 25 win rate (with 120 champions) almost always indicates that a champion is at least a good candidate for Tier 1 or high Tier 2 if the sample size is large enough.