#4 Because Batista is going to retire against Triple H at the grand stage
Batista has already said it a couple of times that he would return only if Triple H is on the other side. It seems like the company was ignoring him from the past few years but now he has got what he wanted: a match against his mentor, Triple H.
Apart from WWE, Batista has made a huge name in the acting industry and is better known as "Drax the Destroyer”. He has worked in many Marvel Films with which has also kept himself a lot more busy than other Superstars. In some time, The Animal will be getting busier day by day which will make it hard for him to return again.
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So it's safe to say that Batista's last match will be against Triple H, which is going to happen in just a few days. Even though the retirement stipulation is only set for The Game, as of writing, the next episode of Raw could shake things up.