The UFC lightweight title challenger has responded to recent criticism from Chandler. Islam Makhachev is responding to criticism over his UFC résumé — again. A month away from his championship fight against Charles Oliveira at UFC 280, Makhachev has had his strength of schedule questioned by several of his counterparts, including Michael Chandler. Though impressed by what he has seen so far, ‘Iron’ wondered if the quality of opponents Makhachev has fought was enough to justify a championship opportunity. “Nothing against Islam, you say he looks great, you say he looks unbeatable at times, but he hasn’t really fought anybody,”…