#2. Brock Lesnar doesn't really need to be in such a match
Brock Lesnar is one of WWE's biggest box-office draws. His reputation alone is enough to get him a world title match. He doesn't need to compete in a contest like the Elimination Chamber, where the chances of a victory are slim.
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We saw how Roman Reigns refused to defend his title inside the Chamber last year, knowing that his reign would be in danger under such circumstances. He went so far as to threaten Adam Pearce, who had no choice but to accept Roman's wishes.
If the Tribal Chief can get what he wants, why can't an intimidating figure like Brock do the same thing? The Conqueror could easily demand a one-on-one title match against Lashley since the latter didn't defeat him cleanly at the Royal Rumble.
After all, why would Lesnar want to risk entering the Elimination Chamber this close to WrestleMania?
#1. If Brock Lesnar gets injured, WWE will be in a huge trouble
The Elimination Chamber is known for its dangerous in-ring action. It is considered one of the most grueling WWE contests because of the physical damage it inflicts on a superstar. The entire draw of the stipulation is that no one leaves it unscathed.
Chances of injury are always high inside a frightening structure like the Elimination Chamber. Brock Lesnar has no experience competing in this modified cage. Hence, he should avoid being in such a contest before the Show of Shows.
If Lesnar suffers an unfortunate injury inside the Chamber, WWE will lose their main attraction for WrestleMania. Vince McMahon would be apoplectic if the Royal Rumble winner is not able to appear at WWE's biggest annual event.
It would be an unrecoverable blow for the company. To avoid any such situation, WWE should remove Brock Lesnar from the Chamber match. He could easily be replaced with someone like Finn Balor or Randy Orton to keep the lineup stacked.