The teams they've played without Kyrie:
Bulls
Pacers (L)
Hornets
Kings
Knicks
Cavs
Basically, while Kyrie has been out, they've been playing all the worst teams in the league, and the loss they had was against the only team in the playoff picture. If they were playing teams like the Lakers, Clippers, Nuggets, Raptors etc, needless to say, you wouldn't be making this dumbass thread.
Why do you keep posting this image which is only based on a small sample size of games?
2018/19 season:
Kyrie on court - 6.2 net rating
Kyrie off court - 1.6 net rating
Horford on court - 6.1 net rating
Horford off court - 2.8 net rating
The Celtics had a worse net rating when Kyrie was off the floor, more than any main rotational player, except for Tatum.
2017/18 season:
Kyrie on court - 5.6 net rating
Kyrie off court - 1.1 net rating
Horford on court - 7.3 net rating
Horford off court - -1.6 net rating
If you take it even further and look at the games that both Kyrie and Horford played in, the margin is almost identical.
Furthermore, you have to be some special type of dumbass to not see that Horford was basically their only big man playing significant minutes, whereas they had Smart, Brown, Rozier etc to replace Kyrie whenever he was off the court.