So where, exactly, is any of this in the ḥadith, and by what method can it be inferred? The matter is perfectly clear and admits no ambiguity; and Allah knows best.
If you were to say, “The muhallil was introduced into this contract only to remove it from the realm of gambling, so his inclusion is a condition,”(1) we reply: the many arguments already set forth are sufficient to show that the contract, without him, is not gambling. And if—purely for the sake of argument—it were gambling without his entry, then his presence would still not eliminate the resemblance to gambling; that resemblance would remain exactly as it was, or even increase. You have absolutely no answer to any of those points,(3) and success is granted by Allah the Exalted.
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They also say:(4) “Your second proof is the ḥadith of Ibn ʿUmar: ‘The Prophet ﷺ raced horses and placed a muhallil between them.’”
This ḥadith,(5) however, is not authentic from the Messenger of Allah ﷺ in any respect. Abū Ḥātim erred concerning it, for its entire chain rests on ʿĀṣim ibn ʿUmar, the brother of ʿUbayd Allah, ʿAbd Allah, and Abū Bakr—the four ʿUmarī brothers.(6)