#4. It could further damage his legacy
The sad truth of the matter is that the once universally-loved Conor McGregor has somewhat of a complicated legacy. He's had multiple questionable moments outside of the octagon and has lost four of his last five fights in the combat sports world.
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While peak-McGregor was an elite fighter in the sport, some members of the MMA world are already beginning to question just how good he was. Returning to action in a boxing fight, where most assume he would suffer another loss, could do even more damage to that legacy.
McGregor's chances of success are much smaller in boxing than they are in MMA. Should he return to the latter, he would have a good chance of being able to showcase why he became such a star and quiet the talk that his skills were overrated.
#3. His chances of winning a world title
While some may disagree with this statement, it doesn't seem unthinkable that Conor McGregor is capable of having one more UFC title run. However, his window for doing so may be closing, and any further ventures into the world of boxing could result in that window being slammed shut.
Baseon a quick glance at the top of the lightweight division right now, one could argue McGregor matches up well. Charles Oliveira has proven to be prone to taking some big shots, and few in the sport hit harder than 'The Notorious'. While Islam Makhachev may be a tougher match-up, he remains rather unproven.
If McGregor returns to MMA as soon as possible, he could easily secure a title shot with just one win. He would then have a fair shot oat winning UFC gold once again. That doesn't seem to be on the cards for him in boxing, so he shouldn't do so and risk losing out on his opportunities in MMA.