Question about Lifter Oil Gallery Plugs

Hello, i am assembling an LA eng. There are two small core plugs at the front that go into the ends of the lifter oil gallery, they sit behind the cam thrust plate. The engine had previously been rebuilt, but i noticed that the previous mechanic had not put them in. I asked another mechanic, he said they are not necessary, he uses silicone on the camshaft thrust plate and lets that seal the galleries.

He said that putting plugs in can block the oil supply to No.1 main bearing, if one of them sits too far in.

Does anyone have any experience with this? I had already installed the plugs when he told me this so now i am worried i might have blocked off the oil hole to #1 Main.

Thanks