[{"_id":1,"players":[{"team":"Arsenal","name":"Saka","distanceRan":8590},{"team":"Arsenal","name":"Aubameyang","distanceRan":9230}],"timestamp":129380193},{"_id":2,"players":[{"team":"Arsenal","name":"Saka","distanceRan":8590},{"team":"Ajax","name":"Aubameyang","distanceRan":9230}],"timestamp":129380193},{"_id":3,"players":[{"team":"Arsenal","name":"Saka","distanceRan":8590}],"timestamp":129380193}]

db.collection.aggregate([{"$unwind":{"path":"$players"}},{"$match":{"$expr":{"$or":[{"$eq":["$players.name","Saka"]},{"$eq":["$players.name","Aubameyang"]}]}}},{"$group":{"_id":{"_id":"$_id","team":"$players.team"},"distances":{"$push":"$players.distanceRan"}}},{"$match":{"$expr":{"$eq":[{"$size":"$distances"},2]}}},{"$unwind":{"path":"$distances"}},{"$group":{"_id":null,"avgDistanceRan":{"$avg":"$distances"}}},{"$unset":["_id"]}])