if each of the tribunal and dagoth ur got their power from lorkhan's heart, and thats only his heart how strong is he?

He's only as powerful as the mortals that become him.

eg. Talos is more powerful than the HoonDing, who is more powerful than Pelinal.
(is the HoonDing a shezzarine? I always assumed he was, anyway)

In the Aldudagga, it mentions that the Greybeards can sing forth the ghost of Shor, "which lay all powers low, even in half-death." Make of that what you will.

Hell no. Hoon'ding is the Warrior Wave condensed and crystallized. Hoon'ding is the inexorable tide, the irresistible force.

Shezzar's just some [SEHT]ty little space-god.

We can say how powerful Lorkhan is... but it's at the scale where it doesn't make any sense.

It's like asking how powerful the sun is. It has a surface temperature of about 5800 Celsius. Water boils at 100, and we're comfortable at around 20. It releases about 126 trillion horsepower. In terms of wattage, we're talking about 385 septillion of 'em. A septillion is basically a trillion-trillion. Total luminosity is about 3.85 × 10²³ kilowatts. That's scientific notation, meaning 385 followed by 23 zeroes. (38,500,000,000,000,000,000,000,000 kilowatts if you want it spelled out)

We can define these, but honestly, try wrapping your head around these figures. I have a hard time of mentally imagining things more than 100 or so without taking any kind of shortcuts (things like one "block" is 50 individuals.) A billion, trillion... that's all basically abstraction to me. I know it's big, and that one is bigger than the other, but I'm not going to be able to truly understand HOW big it is, or how much bigger the other is compared to the first. And I honestly doubt that anyone on Earth can truly do this. Maybe people from Mensa. Maybe.

Lorkhan created Nirn, with the aid of the Aedra. Mortals are (mostly) less than inert viruses to him. That's how powerful he is.