BH tells us a clue at the end of 6.01 will make sense in 6.04

We have the photo of Kirkland with Jane in a chair with arms bound, from the promo for Ep.6.04

Note: Partridge bound with plastic packing ties in 6.01; Jane bound with plastic packing ties in 6.04

I this a major clue? That either BK is RJ or was somehow involved in the Partridge murder?