Coincidentally, have something booked for next June on same routing as OP.

And J is the draw for the stop in Madrid. In our case only 4 instead of 6, and currently have 2 in economy given the 2 award seat release practice.

Though given how attractive that J redemption is from a value perspective, tempted to convince the SO that the two of us in economy just need to take the 5 hour earlier flight to Madrid and book the 2nd leg separately.