I suppose it depends on exactly how and where things fail. But, for example, if I pull the intake at the canister without using whatever cut-off there may be, the siphon will not be broken. The hose will be full of water and assuming that the end is lower than the intake, it will continue to drain just as if I'd started a siphon with the hose. The shape of the "hook" isn't to break siphon, but rather just to fit over the edge of the tank (as the outflow also is formed just typically shorter).No I get the concept of a siphon but if there is a leak in the siphon I would imagine the filter would not function. Like if there is a hook (never heard that term till now) and you disconnected the hose you would leak the water that was currently in the hose and that's it. But in my case you would lose all the water in the tank above the bulkhead.
I guess what I am asking is would this be too risky. I realize it probably would never happen but what if it did.
Yes, there is some potential risk and being lower (at least in some sense and some potential cases) increases some potential modes of failure and the amount of water that could be lost in some cases. Whether that's greater or less than some other alternative depends on specifics of how things might fail.