Ok i have to admit I was sleepy responding to your query earlier. But I get it now. For Lara and Sachin to to even remotely look out of place as atgs, you'd have to have like a handful of batsmen, imo, doing something significantly better than they did: average 60+, score a century every 5 innings or so, average 55 away, have one or two 300 + scores etc. And do so over a reasonable number of tests (100+) vs a mix of great and mediocre bowling. Steve Smith was close for a while when he was going at 64+ after what 80 tests. But we see where he is now. And even then, you'd need like a half dozen or more Steve Smith g-modes over a decent length test career.
Also, for me to consider someone as an atg from a stats pov you have to meet certain thresholds (with few exceptions):
Batting: average 50+, average 45 + away, score a hundred every 5 or so tests, have a monster series or two and,/or have a great series vs a challenging attack etc. Have a good/great record vs the best of your time etc
Bowling: average 25 or less overall (spinners under 30), average 25 or under away (under 30 spinners), at least 1 ten for, take at least 4 wpm (or close to it), SR around 55 or less, great series vs great/challenging batting. Good/great record vs the best. Peer/pundits opinions etc Had Compton and Harvey met those standards, I'd rank them unequivocally atg. The likes of Hobbs, Hutton still do.
Now I know you might say, what about someone like Weekes. He averaged 58 overall and 49 away , yet I don't consider him atg. It's because he sucked vs the best of his time. What about if Viv never got his average back over 50? No doubt it'd take a bit of shine off his greatness imo.
Again, in order for Sachin as an example, to not be considered atg imo, standards would have to go through the roof, which imo is very unlikely to happen.