RPM Invisibility rituals

[qchap]

Hello! I'm starting to understand the RPM system better, so much less questions arise, but now I still have a couple of little new ones.

The question is how do I do the Invisibility ritual? I know that a lot of things in RPM could be done in different ways, so I need some of them, not THE one.

1) What path and effect should I use? I think this part of the question is not too difficult, and I have some options: Greater Destroy Energy (for removing the ability of light to reflect), Greater Control Energy (for making light to go around the subject), Greater Transform Body (for giving the subject superior chameleon-like skin), Greater Transform Matter (similar, but for matter). Do I miss something (e.g. could I Greater Destroy Matter to give it "partial destruction"-can't be seen? Same for Body)? Or maybe some of the effects I listed are wrong?

2) Do I need Altered Traits (Invisibility)? I know the rule of thumb is that you don't need Altered Traits if the subjuct doesn't get control of the advantage. And I understand how It works with something like Flying (giving subject Flying gives it ability to fly, but using only spell effect just lets the caster move it). But I don't understand what should it mean with Invisibility, which is not controllable by default.
If I give an inanimate object Invisibility, it really don't sound like Altered Traits.
If I give someone non-switchable Invisibility, it could harm the subject a lot, because he doesn't get control of it. So it kinda sounds like it doesn't need Altered Traits for it.
But if I give it to my ally rogue, he don't need any control to make advantage of it.
And if I give it to myself, I don't get the control over Invisibility, but I don't need it, because I have control over the spell, which is about the same.
Someone could rule that in some cases it needs Altered Traits, and in some - don't. But then it would become different spells, which is wierd.
Of course, giving switchable Invisibility does need Altered Traits, am I right?
Now, if the answer is "you need Altered Traits for non-switchable Invisibility" (or when I need Altered Traits fot switchable one), then I also need to add the "Can Carry Objects" enhancement (if it's done via Greater Destroy Energy), right? Are "No encumbrance" and "Heavy encumbrance" variants count as different spells?

When I thought about this question first, of course I've done some research. I've found two examples of the Invisibility ritual.

First is Invisibility spell from Dungeon Fantasy 19 on p27 (yes, I know that Incantation Magic is different system, but I think I can take some thoughts about how RPM works from it). It uses Control Elementalism (which I would translate as Greater Control Energy for RPM in this case) and adds Altered Traits, Invisibility (Can Carry Objects, Heavy Encumbrance, +100%). So, it uses the Altered Traits route, even for non-switchable Invisibility.

Second one is from Pyramid 3-114 p23, called Nightdrinker’s Gift. It gives Flying and Invisibility. It does use Altered Traits for Flying (because it would be controlled by subject, and if the subject is the caster - at least he wouldn't need to concentrate to move himself in the air), but does not use Altered Traits for Invisibility, using only Greater Control Energy for it. The difference between the two spells really confused me.

And one bonus question, connected to Nightdrinker’s Gift spell. Greater Control Body is what used there for flying - and I understand why it could be used this way. But could I use Greater Control Energy for Flying? Flavoring it by controlling the kinetic energy of the already-moving object (body), so I don't need to Create it first?
And for moving inanimate objects, could I use Greater Create Energy + Greater Control Energy, for first moving the object in some way, and than gaining control of the motion? Or would the Create effect be Lesser here?