A partner can deputize for another
حَدَّثَنَا عَمْرُو بْنُ خَالِدٍ، حَدَّثَنَا اللَّيْثُ، عَنْ يَزِيدَ، عَنْ أَبِي الْخَيْرِ، عَنْ عُقْبَةَ بْنِ عَامِرٍ ـ رضى الله عنه ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم أَعْطَاهُ غَنَمًا يَقْسِمُهَا عَلَى صَحَابَتِهِ، فَبَقِيَ عَتُودٌ فَذَكَرَهُ لِلنَّبِيِّ صلى الله عليه وسلم فَقَالَ "ضَحِّ بِهِ أَنْتَ."
Narrated `Uqba bin Amir: that the Prophet (ﷺ) had given him sheep to distribute among his companions and a male kid was left (after the distribution). When he informed the Prophet (ﷺ) of it, he said (to him), "Offer it as a sacrifice on your behalf."