I thought I read that you weren't using post. The only items that are returned automatically through the post are fields that have been put in a for helper. What we do is
@Html.DropDownListFor(x => x.Sender, new { @class = "ddlSender" })
then in the script we initialize the kendo part of it
$('.ddlSender').kendoDropDownList();
this way the model item is put in a for helper so it gets posted back to the controller and you get the benefits of the kendo dropdown. Hope this helps