Hmmm the old Bruce Lee argument
An interesting aspect of the JKD is that it was his way, his path, his story. So for his JKD to work for you then you would need to ignore his path and follow your own with only the philosophy of the JKD to carry you through. To study his JKD is like studying someone else's speeches or stories, best you could do is repeat or recycle.
Study everything and anything, every aspect of life can be used, take it all in...use what you can and let the rest go...start again...the cup is ever empty, never intending to be full.
The Buddhist joke is that the cup of the perfect student has a hole in it.
I like to look at the learning process as a structure rather than soup (though soup is a good one).
When you begin your process, you lay a foundation.
You then take whatever building design you have to work with and begin construction.
The design may stay constant or have sections that are different depending on the materials and plans at hand.
And then you have the options of paint, roofing, finish details.
Once finished enough to "live in", you can begin putting in the kitchen, bathrooms, electrical, HVAC, plumbing, etc.
After all this you then consider the carpets, interior paint, etc.
Later on, you may add on a garage, a study, a pool, etc.
You may even tear the house down, clear off the foundation, and start again with a new design.
For me the foundation was hard style karate then I added and altered the design to include various aspects of a dozen styles only to find that none of it worked to the degree I wanted and then I found judo.
I made the hard and tough choice to tear down my house, breakup the foundation, level it all out and start again.
Judo became my foundation that I built my house upon...I did not forget my prior training, I just put it in its own room, a recreation room if you will.
For sabering I have a great deal of experience coming into the process beyond video games, movies, and comic books...I am not 16yrs old...I have been injured and I have injured others...so my style is a focused Soresu without a doubt.
Calm, eyes on the torso, prepared for a shift of position and counter strike...commit and know my intent