We only hold 2 parts of your key for the sake of your accessibility. However, we cannot perform any actions in your wallet as your share of the key is the MOST authoritative one and we cannot take this from you.
Gridlock always remains online with it's 2 provided guardians so that you can always access your wallet, even if your personal guardians are missing. 3 of 5 devices must be online for you to access your wallet.
We designed the 3 of 5 rule so you can always get access even if you lose your guardians, or even if Gridlock went down. It always has to be you and 2 other parts of the network that gets you in.