I just watched this video where it is explained how time dilation causes gravity. It is said in this video that time dilation (caused by masses such as the earth) is the only cause for gravity.
But then, what about the curving of space? Does this not contribute to gravity (by objects following the straightest line as depicted in this image)?
Is gravity only caused by gravitational time dilation, if yes, why does the curving of space not have any effect and if no, how much of gravity is caused by time dilation compared to the curving of space?
Note: I am aware that one cannot actually split the curving of spacetime into two things (the curving of time, and space seperately). I could also ask my question as:
How much of the attractive "force" (well, it is not actually a force) felt by an object in the gravitational field of another object like a planet or star is caused by clocks closer to the object runnning slower (compared to clocks further away) compared to the object moving toward the heavier object due to curved geodesics?