I think what confuses you is that you try to assign a name to a sticking pattern, like "LR must be called xyz". That's not a useful approach to a drummer.
Let's try to get two things straight, the
roll and the
roll basically plays note after note, e.g RLRL or RRLL or RRL or RLR etc. in whatever timeframe. Right stick, left stick, right stick, left stick, done. In terms of arm/hand
movements you'll observe basically arms out-of-phase: if one is up, the other one is down (or on its way), alternatingly.
flam in contrast is hitting with both sticks at the same time ... with a nuance of a shift and lower accent in time: think of two sticks falling onto the snare, where one is just a little bit shifted, say an inch or so ... which translates into a very narrow time interval of "almost same time". If you can hear both sticks, it's not a flam. In terms of arm/hand
- both sticks seem to hit simultaniously,
- while when starting the flam the louder stick will be held higher and arrive just a little-little-bit later
If done correctly, see video here, you'll hear a very characteristic sound, you can't create else on the drumset.
To complete, a
ruff, if you look at the relevant movements of arms/hands, is much more like a roll with a taste of a flam, as you can see here at 01:15.
Though there is a logical convention for notation, one or two short notes with a slur towards the emphasized quarter note (see middle of my 2 videos), it doesn't really address the movement property, which is essential for the sound produced. So the translation from notation to action may be ambigous, depending e.g. on the composer, the drummer etc.
Now, let's return to
your two videos. In both cases you'll see the characteristic movement for a roll, not for a flam, and sounds very uniform and with distinguishable strokes. So call it whatever you think is usefull AND will be understood as you wanted it.
Some final remarks on
stick-techniques. As I indicated in my early comments (stick control), it depends much on the drummer.
A beginners technique is the good habit to have one beat (sound) from one hit (with any stick). So if you want to hear beat-beat-beat-beat, you play carefully hit-hit-hit-hit, or stick-stick-stick-stick.
An advanced drummer, and even a careless drummer, can create multiple beats with one hit only using
rebound (backbouncing of the stick), like:
- beat-beat from hit or stick
- beat-beat-beat from hit or stick
Rebound is widely used, and can sound bad when not under control. I.e. the time intervals tend to become shorter, just like with a steel ball or coin falling on the floor.
So, putting both together a drummer has many options all the time to realize an intended sound, like a notated beat-beat-beat-beat, e.g.:
- RLRL or LRLR (which will probably be precisely in time and sound quite uniform)
- RRLL or LLRR (which may sound less uniform and more rock-n-roll-ish, like in "dada dada didi didi, bat-man!")
- R L or L R (using good controlled rebound; do you see the 3 options using rebound you have per pattern R L or L R?)
So what can you do? Listen and observe:
- how does it sound?
- what are arms, hands and fingers doing (in order of increasing difficulty to observe)?
And as a rule of thumb: you'll hear flams almost never. So a roll is a good first assumption.