When you pull in BootStrap there are additional attributes such as 'crossorigin="anonymous" and integrity="...." '
How can these be added to Script Manager and CSS manager?
Likewise, there would a separation between bootstraps layout and the skin that Telerik an provide. This gives the advantage of it being BootStrap compliant, but with all the skins that Telerik offer, making re-skinning easier. This is one of the biggest bug bares of designing a site with Telerik, is the post-production work on CSS by a third party, as its not 'standards compliant' by which they mean its not like a normal Bootstrap site that they are familiar with.
<link rel="stylesheet" href=https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css
<link rel="stylesheet" href=https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css