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Finally figured it out 

CrossSell (Only fill from selected when peer blank) =

VAR SelectedClient = SELECTEDVALUE ( 'ClientSlicerTable'[Prospect Client Name] )

VAR RowClient      = SELECTEDVALUE ( 'MatrixPeers'[Prospect Client Name] )

VAR CurrOffering   = SELECTEDVALUE ( 'Pipeline'[Service Offering] )

RETURN

IF (

    NOT ISINSCOPE('MatrixPeers'[Prospect Client Name]) || NOT ISINSCOPE('Pipeline'[Service Offering]),

    BLANK(),

    VAR SelectedSector =

        CALCULATE ( MAX('Pipeline'[Client Sector]), REMOVEFILTERS('Pipeline'),

            TREATAS({SelectedClient}, 'Pipeline'[Prospect Client Name]) )

    VAR RowSector =

        CALCULATE ( MAX('Pipeline'[Client Sector]), REMOVEFILTERS('Pipeline'),

            TREATAS({RowClient}, 'Pipeline'[Prospect Client Name]) )

    VAR PeerSales =

        CALCULATE ( [sales], REMOVEFILTERS('Pipeline'),

            TREATAS({RowClient}, 'Pipeline'[Prospect Client Name]),

            TREATAS({CurrOffering}, 'Pipeline'[Service Offering]) )

    VAR SelectedClientSalesForThisOffering =

        CALCULATE ( [sales], REMOVEFILTERS('Pipeline'),

            TREATAS({SelectedClient}, 'Pipeline'[Prospect Client Name]),

            TREATAS({CurrOffering}, 'Pipeline'[Service Offering]) )

    RETURN

        IF (

            RowClient = SelectedClient || RowSector <> SelectedSector || ISBLANK(SelectedSector),

            BLANK(),

            IF ( ISBLANK(PeerSales), SelectedClientSalesForThisOffering, BLANK() )

        )

)