i already gave you such a fossil in the snake case. again: if we can push a species why we cant push several species? (apes or primates)
The number 4 represents snake position in the fossil record
1 2 3 4 5 6 earlier impression
1 2 3 4 5 6 impression thanks to new fossils
Note how 4 is still between 3 and 5 and that the order of the numbers hasn't changed at all, just the distances between them. This is what I would call "acceptable pushing back".
This is what it would be like for humans to predate other apes, with humans being represented by the number 6 since we are a fairly recent species
1 2 3 4 5 6 current impression
1 2 6 3 4 5 hypothetical situation you describe
Notice how the order of the numbers has completely changed and is out of numerical order? This is "unacceptable pushing back".
Now, on the species level specifically, it is extremely difficult to differentiate without very well preserved and decently complete fossils. Thus, it is not unheard of for two different species less than a million years apart to not be able to determine which one came first just on the basis of the small number of fossils we have. Anything above genus, though, and it becomes pretty clear, especially with ones that have living representatives such as snakes.
After all, it is one thing to discover evidence that Homo neanderthalensis predates Homo sapiens when neither are considered to be ancestors of each other and their origins are only 50 thousand years apart (our species is the older one) based on the evidence we currently have, and an entirely different thing to discover evidence of Homo sapiens predating all other bipedal apes we find in the fossil record despite our species being so much farther in terms of adaptations for being bipedal than many of them. I'd be humans predating all of their ancestors unique unto them and then some for humans to predate all other great apes. Snakes, on the other hand, are not predating ANY of the lizard ancestors they have by being pushed back a bit. If it didn't change the order, humans could be pushed back quite a bit, but we are such a recent species that the margin for push back isn't even 1 million years.
How many times do I need to spell it out for you to understand? Order is what matters, the snake fossil doesn't defy order. To be blunt, considering that snake fossils far younger than that one have legs, you'd probably have interpreted that ancient snake species as a lizard with a snakelike head.
say that we will find a gene that its shared between human and a a cat but not in great apes. we can solve this problem by convergent loss in apes. right?
No. The only thing that could hope to reconcile an identical gene between human and, say, housecat lineages that isn't present in any other great ape would be if housecats and humans were genetically more similar to each other than humans were to any of the great apes. Obviously, this is not the case, thus making this significant evidence against evolution.
Heck, 3 different lineages lost the ALX3 gene with an extremely long time scale, while you seem to think it is reasonable for such a complete deletion to happen independently 7 times with a much shorter timescale. This is simply not true.
Find such a gene and you will have decently supported your premise. But it seems to me that you'd rather be defeatist than look for any evidence to support ID, even though for ID to be a relevant position it must have evidence to back it up. Heck, if sufficient evidence was gathered, ID could become the prevailing position just through the merit of having the most evidence supporting it WITHOUT having to discover any evidence that outright disproves evolution. In fact, since all theories must be well evidenced to earn that label, this would be the EASIEST way for ID to gain a foothold within the scientific community. Yet you get uselessly distracted trying to claim that the theory of evolution cannot be disproven.