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Sounds like you are watching videos that show another tool, not the paintbrush. I believe some icons have changed, so they are probably old videos.
Johan is right, they're old videos. The brush was a blue diamond until October last year when Masking was completely overhauled.
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I am using Lightroom v5.3 on a PC, but I always see the Brush tool icon as a paint Brush.
The Radial Gradient shows a blue dot at the centre of the mask overlay..
The Linear Gradient shows a blue square dot at the centre of the Gradient overlay.
Perhaps the iPad is different, or you are confusing the tool overlay point icons.
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Sounds like you are watching videos that show another tool, not the paintbrush. I believe some icons have changed, so they are probably old videos.
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Johan is right, they're old videos. The brush was a blue diamond until October last year when Masking was completely overhauled.