{{- $page := . -}}
{{- $isLead := true -}}
{{- with $page.Params.dossier -}}
  {{- $dossierID := index . 0 -}}
  {{- if $dossierID -}}
    {{- $group := where site.RegularPages "Params.dossier" "intersect" (slice $dossierID) -}}
    {{- if gt (len $group) 1 -}}
      {{- $weighted := slice -}}
      {{- range $group -}}
        {{- if isset .Params "weight" -}}
          {{- $weighted = $weighted | append . -}}
        {{- end -}}
      {{- end -}}

      {{- $candidates := $group -}}
      {{- if gt (len $weighted) 0 -}}
        {{- $sortedByWeight := sort $weighted "Weight" "asc" -}}
        {{- $minWeight := (index $sortedByWeight 0).Weight -}}
        {{- $candidates = where $sortedByWeight "Weight" $minWeight -}}
      {{- end -}}

      {{- $sortedByDate := sort $candidates "Date" "asc" -}}
      {{- $firstDate := (index $sortedByDate 0).Date -}}
      {{- $sameDate := where $sortedByDate "Date" $firstDate -}}
      {{- $firstPage := index (sort $sameDate "RelPermalink" "asc") 0 -}}
      {{- $isLead = eq $firstPage.File.Path $page.File.Path -}}
    {{- end -}}
  {{- end -}}
{{- end -}}
{{- if $isLead -}}true{{- end -}}