So you claim ID first predicted fast speciation. Where? Genesis?
Intelligent Design was born late last month and didn't scoop punctuated equilibrium on anything, unless you're buying off on ID = creationism. Not that I don't think it is, but part of the ID mantra is "Creationism is a strawman!"
The punctuated equilibrium model still says Thing A comes from similar Thing B in fairly smooth steps. (If you can find where to dig for the smooth steps, assuming they even got fossilized.) It can cite evidence from the fossil record that things do happen that way.
Note that in the preceding examples, you can see the changes happening smoothly in one place, whereas they appear abruptly everywhere else (from migration). It makes sense and requires no assumption of supernatural elements.
Which is what ID-er's don't like about it. ID isn't about explaining anything any better. It's about getting rid of those nasty naturalistic explanations.
I don't see where ID offers comparably testable or already-supported content.
Intelligent Design makes a prediction by definition. Designers introduce new models in quantum steps, such as new car models each year. Applying this prediction to the fossil record means that Intelligent Design predicts that the fossil record will show rapid speciation. That happens to be the same prediction made by the current preferred replacement to Darwinism: Punctuated Equilibrium.
It also seems to align rather well with the actual known fossil evidence.
Then you haven't been paying attention to modern science. Would you dare claim that human organs are growing in laboratory pigs due to unaided, natural Evolution, after all?!
Clearly Intelligent Design is supported by testable content by merely looking at such human/pig lab experiments wherein Man has used gene-splicing.
If you want to see where Intelligent Design offers testable and already supported content, then look first in modern scientific labs. The pigs are there.