Hanoi Aide, by Silence, Viewed As Favoring McCarthy Position; HANOI'S FAVORING OF M'CARTHY SEEN
Western diplomats see Nguyen Thanh Le, by his silence, giving more favorable treatment to latest McCarthy Vietnam proposals than to those of other leading Pres contenders whose stands Nguyen Thanh Le recently criticized; latter scores US thrusts into buffer zone, news conf; brushes aside repts that Le Duc Tho arrived in Paris to give Harriman assurances that N Vietnam would refrain from using buffer zone if US would do the same; Harriman says he does not expect talks to be broken off, TV int