Of course it is possible.
Disconnecting the battery would have done the same thing. Sometimes holding the disconnected terminals together resets computers. I believe it empties the internal capacitors.
You did a great job of narrowing it down. Unfortunately the ecm is connected to a lot of things and like the person b4 me said you can find out exact parasitic draw by hooking up an ammeter in series with either battery terminal. Jeff also was correct in suggesting you find the device that clicks next time. You can use a vacuum hose from AutoZone held to your ear for that. We use a stethoscope.
Where was the clicking noise coming from ? Could be a relay the PCM controls . It's possible it will do it again but you never know . If the battery dies again do a parasitic draw test . Improved Methods to Find Parasitic Draw Battery Drains Overnight
SOURCE: battery drains in a few days.
Disconnect the pos while running- if it still runs the alternator is working to run it. If not get the alt diodes tested, it is possible it is causing a drain while sitting. If it is working, check to see if it is overcharging because that can cause the battery to break down- "sulphate"' the plates and cause an internal short that will drive you crazy trying to find the short in an automobile component. If you just make short trips you could just be not charging it enough do deep cycle it. Have the batt tested- its usually free after all. In my part of the country I've never seen a modern 8yr batt last longer than 3 1/2 years, so don't assume it's good.
Another problem is you might have an internal short
SOURCE: I have 2001 F150 that wont shift out of park keeps
A shift release solenoid is to blame causing this problem. It is shorted out and needs to be replaced
SOURCE: shut the truck off an imediately went to start it
check trailer lights plug sounds like it touching the bumper shorting out
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I have one and had the same problem with it,it was the positive battery cable. It fried my battery and alternater. Replaced cable and everything else. It runs great now
Sorry wrong answer for that question
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