#3 Age
Phil Brooks is no spring chicken. The guy is 38-years-old and whilst there are fighters still active that are older than that, they've all had a great deal more experience. Punk has to think realistically about what his goals are here, because the likelihood is that his next opponent will be many years his junior much like Mickey Gall was.
You can say that age didn't play a factor in that result all you want, but we all know that probably isn't the case. His ambitions within the UFC are probably to just win one fight, but as he continues to age his work inside the octagon combined with his general abilities are going to diminish even further.
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It's all well and good following your dream, but there comes a point in time where your trajectory is going down instead of up.
Up next, is a more practical option for Mr Punk.