Laelia growth

I have seen a few laelia growing like this and recently my b.nodosa had a growth like this with what looked like a sheath. may be there is some reason

Looks like a perfectly normal Cattleya alliance new growth to me. I really don't understand what you think is unusual. It will mature to look like the others.

I'm not sure what species or hybrid this is, but it does appear to be a rupiculous Laelia type - meaning it grows in rocks. Long term health of these plants is usually better (like life vs. death) in a mostly inorganic media like it came in. Potting in bark is obviously your choice to make if you prefer it.

It does appear to be at a good stage of growth to repot. That nice healthy new growth is about to put out new roots.

So despite the heat factor I should keep the plant in rocks. Is there a disadvantage using for bark?
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The growth seems ok to me. With bark, keep in mind that it tends to absorb some of the nitrogen so you may want a higher level of that that what you use in rocks or other type media.