I assume Subito is a brand name? Or maybe a technique? I've never heard of it.
Silos is a quite new word. It is used to refer to semi-isolated work groups within (typically) a company, but it could be any situation where people don't communicate adequately, and therefore don't perform as well as they could. A typical example was when Sony bought out two different digital walkman products, because there were two different engineering teams working on the same product, who did not collaborate, and competed instead, and bought out two inferior products. It can also happen with government departments that should be working for the public good, but don't communicate or work together, because they are in bureaucratically different departments.