is bobby lashley doing the right thing?

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Bobby Lashley has challenged the WWE Champion Jhon Cena at the Great American Bash recently. Can he be able to beat Cena? Cena defeated The Great Kaali thrice in consecutive encounters despite being the underdog. Cena never backs out of any challenge. Should Bobby Lashley respect Jhon Cena's credentials and withdraw his challenge and be friends once again? I think so. Give your opinions please!