I can live with them overlaid with at least 1/2 division offset, but its better to have the top of SCL fractionally below the bottom of SDA. That way all you have to do is look at the middle of the two waveforms to read them manually. See the image I posted that I had tweaked to decode it in post #69. Obviously if you were looking for waveform distortions, you'd separate them enough to see any ringing etc. but for checking the data content, the less vertical distance (within reason) you have to move your point of focus, the better.
If you can bring SCL right up to the decode trace, you can easily check for skew by seeing if the ACK bit display is centered on the last SCL pulse in each group of nine.
image 44 is OK, but would benefit by reducing the amplitude of both SDA and SCL by a factor of about 2 using the input attenuators.
Decode trace in the middle is a royal PITA as it makes it much harder to check by manual decoding.
Waveforms that show the scope and signal source working as expected aren't very interesting. Concentrate on the ones you believe to show problems!
Be glad you aren't trying to resolve long I2C messages on an old delay timebase analog boatanchor!
(Not my photo - I'd never have the trace blooming like that)