I have been following Valorant since the beta and have concluded that both Less and Alfa are crucial to their team's success more than anything. While there is debate over who is the better player or sentinel, the reality is that these two players are as essential as the engine of a car or the pillars of a building. Imagine facing FNC or LOUD on Haven or any other map actually, and knowing that Alfa and Less are playing sentinel and holding down one or two sites with their utility. You must then decide whether to attack the site where they are playing or to go to the other site. There are two possible outcomes: if you attack the site where they are, you may kill Alfa or Less but lose more than one player, leaving you in a 4v3 post-plant situation against four of the world's best players. Alternatively, if you go to the other site, you avoid Alfa and Less but risk facing other strong players. Given that these two players have consistently shown their ability to hold the site on their own (and sometimes even manage two sites with utility, as Alfa and Less does), your role is to join the site where two or three players are currently holding. Ideally, you should aim to eliminate all four players (assuming none survive after you secure the site), leaving you with just one player, Alfa or Less, in a clutch scenario. This is undoubtedly a high-risk situation. (assuming you lost 3 or 4 while securing the site)
Furthermore, if you're thinking that catching Less or Alfa to secure the site is an easy task, you'd be mistaken, my friend. In just three rounds of consistently targeting these players' sites, they can accumulate enough ultimate ability points to single-handedly secure a round.
I truly believe if they change teams they would be as important as it is now, they would be as awesome as it is now.