Double thumb Travis picking pattern for low G ukulele

Every Travis picking tutorial for ukulele says "alternate your thumb". This video on low G ukulele is different - the thumb plays each string twice so it matches the placement of the notes played by the double bass (root and fifth of the chord) in the measure. The root shall be played on the first beat, the fifth shall be played in the middle of 4/4 measure, i.e. on the third beat.
The rule of thumb is: play the root - root - fifth - fifth of the chord. The exception is: before the chord change (in the last measure of old chord) play the root - root - fifth - root. The reason for this exception is to avoid early landing on the root of the new chord if it is accidentally the same note as the fifth of the old chord (e.g. when G chord changes to D chord).
The order of bass strings depends on the chord shape. As the G chord shape 0232 has the root on the 4rd string, the thumb starts at that string. In case of the C chord shape 0003 (and D chord shape 2220) the root is on the 3rd string, so the thumb starts at that string.
If possible, select the chord voicings with the root and fifth at the two thumb strings, e.g. Em chord shape 4432. In case of Am chord shape 2000 add the fifth of the chord so the shape changes to 2400.
Some chord shapes have the root on the treble strings, e.g. F chord shape 2010. Here the thumb plays the third - third - fifth - fifth of the chord. Or you may consider alternate shape 5510.
You can morph any Travis picking pattern from the "alternate thumb" to the "double thumb" version. Let the index and middle finger do their original job and change just the thumb pattern.
You may add also some walking bass, as shown at
• Double thumb Travis pi...

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Thanks for the patterns.

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